ensure [ɪn'ʃʊə(r)]

以下由轻松背单词网站提供

vt.保证，担保；保护，使安全

to make something certain to happen

I will ensure that the car arrives by six o'clock. 我保证汽车六点钟以前到。
This medicine will ensure you a good night's sleep. 这药能保证你睡一夜好觉。