to stack up
[phrase form: stack]
01
堆叠, 摞起来
to neatly arrange objects, usually in a vertical arrangement, forming piles
Transitive: to stack up sth
例子
The librarian worked diligently to stack up the returned books in their designated places on the shelves.
图书管理员勤奋工作，将归还的书籍堆叠在书架上的指定位置。
After finishing the puzzle, she decided to stack the pieces up neatly on the table.
完成拼图后，她决定将碎片整齐地堆叠在桌子上。
02
堆积, 在空中排队
(of aircraft) to fly over an airport at different heights, waiting for specific landing instructions
Intransitive
Transitive: to stack up an aircraft
例子
Due to heavy air traffic, planes had to stack up over the airport, causing delays in landing.
由于空中交通繁忙，飞机不得不在机场上空盘旋，导致降落延误。
During the storm, planes were forced to stack up in the air, creating a challenging situation for air traffic control.
在风暴期间，飞机被迫在空中堆积，给空中交通管制带来了挑战性的情况。
