重点讲解：
1. each other 彼此；互相；
例句：We should always help each other.
我们应始终互相帮助。
2. think of 想到；想起；想出；
例句：I shudder to think of the problem ahead of us.
我想到摆在面前的问题就不寒而栗。
3. tend to do sth. 往往会；经常就；
例句：People tend to gain weight on holidays.
人们常常在假期长胖。
4. look for 找；寻；
例句：He began to look for another position immediately.
他马上开始寻找另一个职位。

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