1.kept up 保持 继续 维持 跟上(时代)
例句: The house is becoming too expensive for them to keep up.
他们的房子维修费用贵得越来越修不起了。
2.pointed out 指出;指明,说明;使注意到
例句: He pointed out the interesting parts to us.
他把有趣的地方指给我们看。
3.had not an idea 一点不知道; 听也没有听过;没办法
例句:I have no idea why he resigned his post.
我不知道他为何辞去他的职务。
4.leave it to 顺其自然
例句: We mustn't leave it to take its own course.
我们不能听其自然。