1.make certain of;
This nest egg will ensure a nice retirement for us
2.be careful or certain to do something; make certain of something;
He verified that the valves were closed
及物动词 vt. 1.保证;担保[O9][+that][+v-ing] I can't ensurehis being on time. 我不能保证他的准时。 I can't ensurethat he will be there on time. 我不能担保他会及时到那儿。 This medicine will ensureyou 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)]