Language Points

1.enough:adj./adv./n. 1)We have enough time. 2)Is this good enough? 3)I have had enough, thank you.

2.as a result/as a result of. 1)He was very careless. As a result, he didn’t pass the test. 2)As a result of his carelessness, he didn’t pass the test.

3.die out渐渐消灭;灭亡 die away 渐渐消失die down渐息 die from 因……而死 die of 因……而死die off相继死亡