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重点讲解：
1. kill off 被全部杀死；被灭绝；
Their natural predators have been killed off.
它们的天敌被全部杀死。
2. to death (用于动词后）以致死亡；
He was stabbed to death.
他被刀刺中身亡。
3. in the face of 面对；在…面前；
Little companies are known for their pluck and perseverance, even in the face of a recession.
小公司的勇气和坚毅是出了名的，即使面对经济衰退也是如此。
4. adapt to 适应；
The world will be different, and we will have to be prepared to adapt to the change.
世界会变得不同，我们必须做好准备以适应其变化。
n. 发源地，来源，原始资料
