ensure doing sth. 确保做某事
ensure that... 确保……
ensure sth.to sb. 保证给予某人某物
ensure (sb.) against/from sth.
保护(某人)免受危害，
使(某人)安全
①To ensure the child’s quick recovery, the doctor gave him an injection. 为了确保孩子尽快康复， 大夫给他打了针。
②There must be safety devices to ensure workers against accidents.
一定要有保护工人避免工伤事故的安全装置。
③Please ensure__that all lights are turned off.
请务必将所有的灯都关掉。
