Always make a backup disk as an insurance policy.
为保险起见，每次都要做备份磁盘。
She gave false information to the insurance company.
她向保险公司提供了不真实的'资料。
Assessing insurance risk can never be an exact science.
估定承保的风险永远不会成为一门精确的科学。
They trade on people's insecurity to sell them insurance.
他们利用人们的不安全感向他们推销保险。
At that time people had large families as an insurance against some children dying.
那时人们养的子女很多，以防有孩子夭折。