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to stack up
[phrase form: stack]
01
堆放, 叠放
to neatly arrange objects, usually in a vertical arrangement, forming piles
Transitive: to stack up sth
Example
The librarian worked diligently to stack up the returned books in their designated places on the shelves.
图书管理员努力地将归还的书籍堆放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，她决定将拼图块整齐地叠放在桌子上。
02
排队待降, 堆叠待降
(of aircraft) to fly over an airport at different heights, waiting for specific landing instructions
Intransitive
Transitive: to stack up an aircraft
Example
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方排队待降，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，飞机被迫在空中排队待降，造成了空中交通管制的挑战情况。
