insurance against的用法和樣例：
例句
- I bought another safety lock as an additional insurance against thieves.
＂我又買(mǎi)了一把保險鎖，以加強防賊的安全措施。＂ - I bought another lock as an additional insurance against thieves.
我又買(mǎi)了一把鎖，以加強防賊的安全措施。 - He's applying for two other jobs as an insurance against not passing the interview for this one.
他還申請了另外兩份工作，以防這份工作面試不合格。
