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重点讲解：
1. at least （表示更正或改变自己刚说过的话）至少，起码；
It's not difficult to get money for research or at least it's not always difficult.
争取到研究资金并不难，起码不总是那么难。
2. be able to do sth. 可以…的，能够…的；
He should be able to lead a perfectly normal life.
他应该能够过上完全正常的生活。
3. fight back 反击；还击；
He ducked the first few blows then started to fight back.
他躲开最先几拳后便开始反击。
4. bite off 咬掉；
He was so hungry, he wanted to bite off half of my hamburger.
他是如此的饿，他想要将我的汉堡咬掉一半。
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