vt.

1. 保證；擔保[O9][+that][+v-ing]
   I can't ensure his being on time.

   我不能保證他的準時。

   I can't ensure that he will be there on time.

   我不能擔保他會及時到那兒。

   This medicine will ensure you a good night's sleep.

   這藥將保證你一晚睡眠良好。

2. 使安全，保護[Q][（+from/against）]
   These are safety devices to ensure workers against accidents.

   這些安全設施是為了保護工人不出事故。

v.