英语小问题,谢谢回答

guarantee
n. (名词 noun)
保证;商品保证;保证书[C][U][+that]
The TV set has a year's guarantee.
这架电视机有一年的保修期。
You have my guarantee that I'll finish the job on time.
我向你保证按时完成工作。
起保证作用的事物[C][(+of)][+that]
A diploma is no guarantee of efficiency.
持有文凭不能保证工作效率一定高。
担保品,抵押品[C]
I can offer my land as a guarantee.
我可拿出我的地产作抵押品。
保证人;被保证人[C]
vt. (及物动词 transitive verb)
保证;担保[+to-v][+(that)][O1][O8]
Perfect satisfaction is guaranteed to our customers.
保证我们的顾客完全满意。
包,管保[+(that)]
保障,保证...免受损失(或伤害等)[(+against/from)]
The policy guarantees us against all loss.
这种保险契约保障我们免受任何损失。

insure

vt. (及物动词 transitive verb)
为...投保;接受保险[H][(+against)]
Insure your baggage before you leave home.
离家前先给行李保险。
【美】保证,确保[+(that)][O1]
More care would insure you against making so many mistakes.
多加注意就能保证你不犯这麼多的错误了。

assure

vt. (及物动词 transitive verb)
向...保证,担保[(+of)][O5]
I can assure you of the reliability of the information.
我向你保证这消息可靠。
The captain of the ship assured the passengers that there was no danger.
船长向乘客保证没有危险。
使确信,使放心[(+of)][O5]
We assured our clients of an enjoyable holiday.
我们使游客确信准能过一个愉快的假期。
(后接oneself)使弄清楚,使确定[O5]
They assured themselves that the bridge was safe before crossing it.
他们直到弄清楚那座桥确实安全后才通过。
确保,保障
Her future was assured.
她的未来是有保障的。
保证给予[O1]

以上!网上字典说的!

ensure vt. 保证; 担保, 保险 保护; 使安全(against, from) 保证给, 赋予(to, for) ensure success [safety, supplies] 保证成功[安全, 供应] ensure sb. against[from] danger 保护某人免受危险 A letter of introduction will ensure you an interview. 凭一封介绍信准保会接待你。

assure vt. 使确信, 使放心 向...保证; 郑重宣告 保障 对...进行保险(主要指人寿保险) The news assured us. 这消息使 我们放心了。 I assure you (that)there's no danger. 我向你保证没有危险。 Nothing can assure permanent happiness. 没有什么东西能确保永久的幸福。

guaranteen. 保证, 担保, 保证书 保证人(法律上用guarantor) 担保品, 抵押品 [俗](可能发生的)迹象 接受保证的人 stand guarantee f