不算高人....
To “assure” a person of something is to make him or her confident of it. According to Associated Press style, to “ensure” that something happens is to make certain that it does, and to “insure” is to issue an insurance policy. Other authorities, however, consider “ensure” and “insure” interchangeable. To please conservatives, make the distinction. However, it is worth noting that in older usage these spellings were not clearly distinguished.
所以,insure一般用于给保险打包票,ensure可以和它互换(有些权威人士说).assure用于告诉某人某事行得通.ensure就是要确保这事发生。
Secure一般是指
安全感,而且形容词意思是"保险的".
参考资料:freeonlinedictionaty
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