(4)学习和记忆一件事最好的方法是将它再解释给别人。因为当你解释的时候，你会尽量提炼核心意思，这样会让你更加巩固。
The best way to learn and remember something is by trying to explain it to someone else, we tend to simplify things when explaining them to others, therefore this might help you to concentrate on the most important hits of information that you wish to remember.
(5)如果你觉得有人在盯着你看，那么你可以看下手表或者手腕，如果那人确定是在看你，他也会下意识看向自己的手表或手腕的。
If you think someone is watching you, look at your watch or where your watch would be. If they are watching you they will usually look at their wrist/watch.
(6)还有一种判断对方有没有在看你的方法是打呵欠。如果他也打了，那么就是。因为打呵欠会传染。
You know that feeling when you sense that someone is watching you, but you're not really sure? Try yawning and then look at the person whom you suspect of watching. If they yawn too–then you know the person was watching you, as yawning is contagious.
