有两手准备 meaning in Chinese

have two strings [a second string] to one bow 短语和例子

You 'd better have two strings to your bow , just in case of emergency .
你最好有两手准备，以防万一。
As both a novelist and a university lecturer , she has two strings to her bow .
她又是小说家又当大学讲师，有两手准备。
As both a novelist and a university lecturer , she has two strings to her bow
她又是小说家又当大学讲师,有两手准备
As both a novelist and a university lecturer , she has two strings to her bow
她又是小说家又当大学讲师,有两手准备