under

在…下面、在…底下

The keys were hiding under a pile of old newspapers.

钥匙藏在一叠旧报纸下面。

低于、不到、少于

Almost everything in this store costs under three hundred dollars.

这家店里几乎每样东西都不到三百元。

在…管理下、在…统治下、隶属于

The team has improved a lot under the new coach.

在新教练带领下，这支队伍进步很多。

依照、根据正式

Under the new rules, employees may work from home twice a week.

依照新规定，员工每周可以在家工作两天。

处于…中、在…状态下

The bridge has been under construction for almost two years.

这座桥已经施工将近两年了。

以…名义、用…（名称）

She published her first three novels under a pen name.

她的前三本小说是用笔名出版的。

在下面、到下面、沉下去

The swimmer dove and stayed under for almost a minute.

那名泳者潜下去，在水面下待了将近一分钟。

以下、不足

This ride is only for children aged ten and under.

这项设施只限十岁以下的儿童搭乘。

倒闭、破产口语

Several small bookstores went under during the long recession.

在漫长的经济衰退期间，好几家小书店都倒闭了。

昏迷、失去意识

The anesthetic kept him under for nearly three hours.

麻醉剂让他昏睡了将近三个小时。

下面的、下层的

Check the under surface of each leaf for tiny insects.

检查每片叶子的背面有没有小虫。