重点讲解：
kill off 被全部杀死；被灭绝；
例句：Their natural predators have been killed off.
它们的天敌被全部杀死1V,wQiR|wjdXu]4UBMG。
2. be far from 根本不；远远不；
例句：His explanation was far from satisfactory.
他的解释一点也不令人满意QCnRC%ku&iiD。
3. turn out 结果发现；结果是；
例句：It turned out to be a wild-goose chase.
结果证明这只不过是一场徒劳#MLg4DJX=[b。
4. due to 由于；因为；
例句：Accidents due to driving at high speed were very common that weekend.
在那个周末因高速驾驶造成的交通事故很多(7aiDW~Y%bt^ob#@+WVn。