- extending or directly below在…底下：
vast stores of gas under the North Sea
北海海底蕴藏着的大量天然气
the streams that ran under the melting glaciers.
融化冰河下流淌的小溪。
- below (something covering or protecting)在（覆盖保护物）下面：
under several feet of water
在数英尺水下面
a hot plate under an insulated lid.
绝缘层下的加热板。
- at a lower level or layer than在…下面：
the room under his study.
他书房下面的房间。
- behind (a physical surface)在（有形表面）的后面：
it was written on the new canvas under a gluey coating.
写在一块新油画布上涂胶层后面。
- behind or hidden behind (an appearance)在（外表）的后面：
he had a deep sense of fun under his quiet exterior.
在他文静外表后面是深深的乐趣追求。
- lower in grade or rank than（职务, 级别）低于：
under him in the hierarchy.
等级制度中在他以下。
- used to express dominance or control受制于：
I was under his spell.
我受制于他的魔力。
- during (a specified time period)在…期间：
the coinage standard was reformed under Elizabeth I.
硬币制在伊丽莎白一世时期被改革。
- as a reaction to or undergoing the pressure of (something)承受着; 在…的重压下：
the sofa creaked under his weight
沙发在他的重压下吱吱作响
certain institutions may be under threat.
某些制度可能受到威胁。
- as provided for by the rules of; in accordance with根据…规定：
flowers supplied under contract by a local florist.
由当地一花商按合同供应的鲜花。
- used to express grouping or classification属于：
file it under 'lost'
将它归在“遗失”项目下
published under his own name.
用他自己名字出版。
- Computing within the environment of (a particular operating system)【计算机】在（某个系统）下：
the program runs under DOS.
该程序在 DOS系统下运行。
- lower than (a specified amount, rate, or norm)低于（特定数量, 比例, 标准等）：
they averaged just under 2. 8 per cent.
他们平均不到2.8%。
- undergoing (a process)在（过程）中：
under construction.
建设中。
- in an existent state of在…生存条件下：
children living under difficult circumstances.
生活在艰苦环境中的儿童。
- planted with栽有：
fields under wheat.
麦田。
- extending or directly below something在下面; 在下方：
weaving the body through the crossbars, over and under, over and under.
在单杠上上下不停转身。
- under water在水底; 往水底：
he was floating for some time but suddenly went under.
他在水上漂了一段时间后突然下沉。
- affected by an anaesthetic; unconscious麻醉作用下无意识的：
the operation was quick, she was only under for 15 minutes.
手术很快, 她只麻醉了15分钟。
under way
- having started and making progress在进行中。
- (of a boat) moving through the water（船）在航行中：
no time was lost in getting under way.
马上便起航了。
ORIGIN: mid 18th cent. (as a nautical term): from Dutch onderweg.