重点讲解：
1. look for
找；寻；
eg. We all need to look for ways to reduce our carbon footprint.
我们都需要寻求降低碳排放量的方法。
eg. As the tide receded we were able to look for shells.
潮水退去，我们就能寻找贝壳了。
2. hear from
接到…的信（或电话）；
eg. Drop us a line, it's always great to hear from you.
给我们写封短信，能收到你的信总是让人很高兴。
eg. I expect to hear from you as soon as possible.
我期待着能尽快得到您的消息。
3. go over
检查；复习；回顾；重温；
eg. At every competition, the judges have an initial meeting where we go over the general rules.
在每次比赛前，所有裁判会有一个会议来回顾一遍所有的规则。
eg. Let's go over some of these elements mentioned above so you can get a better idea of what I mean.
让我们重温一下上面提到的概念，这样你可以更好的理解我的意思。
4. keep sth. in mind
牢记；放在心上；
eg. We must keep this lesson in mind.
我们要记住这个教训。
eg. That's something we have always to keep in mind.
那是我们应该经常记在心里的。
