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Nak9#*5y1gNo0D。
2. to death (用于动词后）以致死亡；
He was stabbed to death.
他被刀刺中身亡Hw=_Bo#FnZiI。
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3CwQMQYwE#%E.x#9[,Qn。
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JYisjG9C55FHBba9)GMT。