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重点讲解：
1. trade
这里用作“交换”的意思；
eg. Kids used to trade baseball cards.
以前孩子们常常互相交换棒球卡片。
eg. They traded land for goods and money.
他们用土地换取了货物与金钱。
eg. They suspected that Neville had traded secret information with Mr Foster.
他们怀疑内维尔和福斯特先生交换了秘密情报。
2. look for
找；寻；
eg. I had gone to Maine looking for a place to work.
我去了缅因州找工作。
eg. He began to look for another position immediately.
他马上开始寻找另一个职位。
eg. The searchers fanned out to look for the missing man.
搜寻人员四下散开寻找失踪者。
vt. 养育，培养，促进，鼓励，抱有（希望等）
