161 It's a good idea for sb to do sth对……来说是个好主意
162 It's important to sb对某人来说很重要 eg: It's important to me
163 It's time to do sth It's time for sth到了该去做某事的时间
eg: It's time to have class It's time for class该去上课了
164 join= take part in参加
165 just now刚才
166 keep+ sb/ sth+ adj/介词短语让什么保持什么样?
167 keep out不让……进入
168 keep sb adj让……保持…… eg: I want to keep my mother happy keep healthy保持健康
169 key to+名词表示：某物的钥匙或某题的答案
170 key to… anser to… key可以是答题或钥匙
171 laugh at…取笑…… eg: Don't langh at others We langhed at the joke
172 learn by oneslfe自学
173 learn from sb向某人学习 eg: We should learn from Lei Feng
174 learn to do sth学做某事
175 let sb do sth让某人做某事
176 Let sb down让某人失望 eg： We shouldn't let our farents down我们不应该让我们的父母失望
177 live from离某地远
178 live in+大地方/ at+小地方居住在某地 eg: I live in LuZhou She lives at XuanTan
179 look after= take care of照顾照看
180 lose one's way谁迷路 eg: Lose your way你迷路
