重点讲解：
1. let on
透露；泄露；
eg. She never let on that anything was wrong.
她从来没有透露过有什么不妥。
eg. I didn't let on to the staff what my conversation was.
我没有将谈话内容向员工们透露。
2. start out
启程，出发；
eg. Mother told her son to start out early and start back early.
母亲告诉儿子早去早回。
eg. The rain will let up soon and we can start out.
雨不久就会停，咱们可以出发了。
3. adjust to
改变（行为或观点）以适应；调节；习惯；
eg. I felt I had adjusted to the idea of being a mother very well.
我感到自己已经完全接受了当妈妈的想法。
eg. After Nigel left his academic post and went into business, it took him quite a while adjust to the rat race.
奈杰尔弃学从商后，过了很长时期才使他适应于那种竞争激烈的环境。