重点讲解:
1. have to do sth. 需要;必须;不得不;
例句:We have to resolve this matter once and for all.
我们必须彻底解决这一问题 。
2. be able to do sth. 可以…的,能够…的;
例句:He was able to hold back his anger and avoid a fight.
他忍住了怒气,避免了一场殴斗 。
3. whether or 无论;不管;
例句:This happens whether the children are in two-parent or one-parent families.
不管孩子是生活在双亲还是单亲家庭,这种情况都会发生 。
n. 保险,保险费,安全措施