under control[]在..控制之下
under the circumstances[]在这种情况下，(情况)既然如此
under way[]在进行中，(船)在航行中
up and down[]来回，上上下下；前前后后；到处
up to[]直到；高到，达到；取决于
up to date[]现代化的；切合目前情况的
use up[]用完，用尽；精疲力竭
vice verse[]反过来也一样
vote down[]否决
vote for[]投票赞成
vote on[]就...表决
walks of life[]各行各业，各界
warm up[]加热；兴奋起来；变热
wash up[]洗餐具；洗手洗脸
watch out for[]当心，提防
wear off[]逐渐消逝
wear out[]用破，磨损；使精疲力竭
what about[]怎么样
what if[]如果...将会怎么样
whether...or[]是…还是…，不管...还是
wind up[]上发条；使紧张，兴奋；结束
with regard to[]关于
with respect to[]关于，至于
with the exception of[]除...之外
word for word[]逐字地
work at[]钻研；从事于，致力于
work out[]解决；想出，制定出
would rather...than[]宁愿…也不
write off[]取消，注销；勾销