ensure

动词 ensure:

1. make certain of
   同义词：guarantee, insure, assure, secure
2. be careful or certain to do something; make certain of something
   同义词：see, check, insure, see to it, control, ascertain, assure

1. The doctors were zealous in their efforts to ensure the survival of premature babies.
   医生们在努力保证早产婴儿成活方面热情很高。
2. We must ensure the purity of drinking water.
   我们必须确保饮用水的纯净。
3. People should wash regularly to ensure personal hygiene.
   人们应经常洗澡以保证个人卫生。
4. If you want to ensure that you catch the plane, take a taxi.
   你要想确保能赶上那班飞机，就坐出租车去吧。
5. This medicine will ensure you a good night's sleep.
   这药保证能让你好好睡一觉。

en.sure

v.tr.（及物动词）
en.sured,en.sur.ing,en.sures
To make sure or certain; insure:
使确信或肯定；保证：
例句：
Our precautions ensured our safety.See Usage Note at assure
我们的预防措施保证了我们的安全参见 assure

来源：
Middle English ensuren
中古英语 ensuren
from Anglo-Norman enseurer
源自 英法语 enseurer
Old French en- [causative pref.] * see en-
古法语 en- [使役前缀] *参见 en-
Old French seur [secure] [variant of] sur * see sure
古法语 seur [安全的，使安全] [] sur的变体 *参见 sure