Always make a backup disk as an insurance policy.

　　為保險(xiǎn)起見，每次都要做備份磁盤。

　　She gave false information to the insurance company.

　　她向保險(xiǎn)公司提供了不真實(shí)的資料。

　　Assessing insurance risk can never be an exact science.

　　估定承保的風(fēng)險(xiǎn)永遠(yuǎn)不會成為一門精確的科學(xué)。

　　They trade on people's insecurity to sell them insurance.

　　他們利用人們的不安全感向他們推銷保險(xiǎn)。

　　At that time people had large families as an insurance against some children dying.

　　那時(shí)人們養(yǎng)的子女很多，以防有孩子夭折。