-在某方面擅长：know the stuff/ropes/tricks/one's beans

-逐步地：gradually, step by step, bit by bit, little by little, inch by inch , piece by piece, line by line, word by word.

-bottom line 说话的核心，well, the bottom line is that…

-check out①检查，询问②借书③出院④退房

-come in handy 派上用场，会有用的

-for the life of sb无论如何

-get over: ①完成作业②病全愈③忘掉（不愉快）

-go through ①用完②检查③经历过④办手续

-我认为I suspect, 我确认I bet, 我估计I expect, 我不认为I doubt, 我原以为I thought, 我原以为I was hoping, 我曾经是I used to be, 我本应该I was supposed to

-on one's way 马上出发; on the way已经在路

-pick up ①取东西②接人③买东西

-put up ①挂起②住宿

-up to :胜任：it's up to sb to do sth, sb is up to doing sth②熬夜sit/be up to do sth③达到up to sth