assurance
1.除人寿保险以外，说保险通常不用assurance而用insurance。即使说人寿保险，现在用life assurance也不及用life insurance普通。在美国几乎完全不用。参见assure 2
2.assurance（保证，断言）往往用复数形式。例如：
- Despite her assurances, I did not believe her.
3.下面三句意思相同：
- He needed an assurance that he could reach home safely.
- He needed the assurance that he could reach home safely.
- He needed assurances that he could reach home safely.
注意第三句里assurances前面没有the。
