under
01
在...下面, 下方
in or to a position lower than and directly beneath something
例子
She found her keys under a pile of papers on her desk.
她在桌子上的一堆文件下面找到了钥匙。
The cat hid under the table when it heard a loud noise.
猫听到一声巨响后躲到了桌子下面。
例子
The letter was buried under a stack of old newspapers.
那封信被埋在一堆旧报纸下面。
He hid his money under a loose floorboard.
他把钱藏在了一块松动的地板下面。
例子
Under her cheerful smile, she was hiding sadness.
在她欢快的笑容之下，隐藏着悲伤。
He maintained professionalism under his nervousness.
他在紧张之下保持了专业性。
例子
The sergeant is under the captain in the hierarchy.
在等级制度中，中士低于上尉。
He is under the vice president in the company's structure.
他在公司的结构中低于副总裁。
例子
Children under five eat for free.
五岁以下的儿童免费就餐。
Inflation stayed under 3 % for the year.
通货膨胀率全年保持在3%以下。
05
在...之下, 在...的统治下
being subject to the rule, authority, or governance of something or someone
例子
The country is under the rule of a monarchy.
这个国家处于君主制的统治之下。
The country is under military rule.
这个国家处于军事统治之下。
5.1
在...之下, 根据
confirmed, issued, or made valid through the authority or signature of someone
例子
The document was signed under the mayor's seal.
该文件是在市长的印章下签署的。
The agreement was ratified under the governor's hand.
该协议在州长的手下获得批准。
5.2
在...之下, 在...统治期间
within the time span or during the leadership of a particular individual or government
例子
The cathedral was built under King Henry VIII.
大教堂是在亨利八世统治时期建造的。
Major reforms were introduced under the prime minister's tenure.
在首相的任期期间，进行了重大改革。
06
根据, 按照
in conformity with or following a particular standard, rule, or guideline
例子
The company operates under strict quality standards.
该公司按照严格的质量标准运营。
The students must work under the guidelines provided by the instructor.
学生必须按照教师提供的指导方针工作。
例子
The bridge collapsed under the strain of heavy traffic.
这座桥在繁忙交通的压力下倒塌了。
He cracked under interrogation.
他在审讯 下 崩溃了。
08
在...下, 属于
placed in or categorized within a particular heading or classification
例子
The book falls under the category of science fiction.
这本书属于科幻小说的类别。
The product is under the electronics section in the store.
该产品在商店的电子部分下。
8.1
在...之下, 用
using a particular name, alias, or designation
例子
He traveled under a false name.
他以假名下旅行。
The artist worked under several pseudonyms.
这位艺术家以几个化名工作。
8.2
在...下, 在...框架内
(in computing) operating within the framework or system of a specified computer environment
例子
The program runs under Windows 11.
该程序在Windows 11 下运行。
This software operates under Linux.
该软件在Linux 下运行。
09
在...过程中, 在...之下
being in the process of a particular action, treatment, or change
例子
The material is currently under review.
该材料目前正在审查中。
He is currently under medical treatment.
他目前正在接受医疗治疗。
9.1
在...之下, 在...中
existing within a particular condition or situation
例子
They lived under constant fear.
他们生活在持续的恐惧之下。
The country remains under economic sanctions.
该国仍然处于经济制裁之下。
10
在...之下, 种植着特定作物
cultivated with a particular crop or vegetation
例子
The field is under wheat this season.
这个季节田地种着小麦。
Several acres are under corn.
几英亩土地种着玉米。
11
在...之下, 出生于...之下
born during the astrological time associated with a specific zodiac sign
例子
She was born under Leo.
她出生在狮子座之下。
Artists born under Pisces are said to be very creative.
据说在双鱼座出生的艺术家非常有创造力。
12
在...之下, 由...驱动
moved or driven by a particular mode of propulsion
例子
The ship sailed under steam.
船在蒸汽下航行。
The vessel drifted under sail.
船在帆下漂流。
under
01
下面, 下方
at or to a position directly beneath or lower than something
例子
The ball rolled under and disappeared from sight.
球滚到下面并从视线中消失了。
He ducked quickly under to avoid the swinging branch.
他迅速低下身子以避免摇摆的树枝。
02
下面, 在下面
into a position where something is buried, hidden, or covered by something else
例子
The car was buried under after the avalanche.
雪崩后，汽车被埋在了下面。
Their supplies were trapped under after the landslide.
山体滑坡后，他们的物资被埋在了下面。
03
下, 下面
downward beyond the horizon or out of sight
例子
As evening approached, the sun slipped under.
随着傍晚临近，太阳滑落到地平线下。
They watched the moon sink under in the early dawn.
他们看着月亮在黎明时分沉下地平线。
04
下, 水下
below the surface of water
例子
The submarine dipped under and vanished from sight.
潜艇水下下潜并从视线中消失。
He held his breath and swam under to retrieve the lost ring.
他屏住呼吸，游到水下去取回丢失的戒指。
例子
The discount applies to purchases of $ 50 or under.
折扣适用于50美元或以下的购买。
Children four and under enter the museum for free.
四岁及以下的儿童可免费进入博物馆。
06
下, 麻醉
into a state of being unaware or insensible, especially from anesthesia or exhaustion
例子
He was quickly put under for the surgery.
他很快被麻醉以进行手术。
The blow to the head knocked him under instantly.
头部的一击立刻让他失去知觉。
07
下, 之下
into a state of being controlled, governed, or subordinate
例子
The rebels were forced under by the advancing army.
叛军被前进的军队强迫在控制下。
They brought the unruly region under within months.
他们在几个月内将难以驾驭的地区置于控制之下。
08
倒下, 崩溃
into a state of collapse, destruction, or failure
例子
Many small businesses went under during the recession.
许多小企业在经济衰退期间倒下了。
The storm took several fishing vessels under.
风暴使几艘渔船沉没。
under
01
下面的, 底部
located on or forming the bottom side or surface of something
例子
The under side of the leaf had tiny white spots.
叶子的下面有微小的白点。
They painted the under frame of the table to prevent rust.
他们给桌子的下框架涂了漆以防止生锈。
02
麻醉中, 无意识的
in a state of being rendered insensible or unconscious, especially by medical anesthesia
例子
The patient was still under when the nurse checked his vitals.
护士检查病人的生命体征时，病人仍然处于麻醉状态。
She was under for the entire operation.
她在整个手术过程中都处于麻醉状态。
03
不足, 下
being below the expected, required, or ideal level of a specific quality
Informal例子
The soup was a little under and needed more seasoning.
汤有点淡，需要更多的调味料。
This batch of bread feels under compared to yesterday's.
这批面包感觉比昨天的差。
例子
He worked closely with the under manager on the project.
他与副经理在项目上紧密合作。
The under officers reported directly to the general.
下级军官直接向将军汇报。
under-
01
下, 亚
used to indicate a position lower than or beneath something else
例子
She packed her underclothes neatly into the suitcase.
她将内衣整齐地装进了手提箱。
The plumber inspected the underfloor piping for leaks.
水管工检查了地板下的管道是否有泄漏。
02
不足-, 下-
used to indicate something done to an inadequate or insufficient degree
例子
The children at the shelter were severely undernourished.
收容所的孩子们严重营养不足。
His argument was weak because it was underdeveloped.
他的论点很弱，因为它不够发达。
Under
例子
The cashier reported a small under at closing.
收银员报告了结账时的一个小短缺。
The auditor noted several minor unders in the report.
审计员在报告中指出了几处小的不足。
02
不足, 赤字
an instance of being under a required size, amount, or standard
Informal例子
He caught only unders during the fishing trip.
他在钓鱼旅行中只钓到了尺寸不足的鱼。
The contest rules disqualified any unders caught during the tournament.
比赛规则取消了在比赛期间捕获的任何不足。
