1. 保证 ; 担保 [O9][+that][+v-ing] I can't ensure his being on time. 我不能保证他的准时。 I can't ensure that he will be there on time. 我不能担保他会及时到那儿。 This medicine will ensure you a good night's sleep. 这药将保证你一晚睡眠良好。

2. 使安全 , 保护 [Q][(+from/against)] These are safety devices to ensure workers against accidents. 这些安全设施是为了保护工人不出事故。