have another/more than one string to your bow idiom UK      
 还有一手;有两手准备
to have more than one interest, skill, or resource that you can use if you need to
  I enjoy my work, but I'd like to have another string to my bow in case I lose my job. 我喜欢我的工作,但我想做好两手准备,以防万一失业。 
 She is a multi-talented woman with many strings to her bow. 她多才多艺,有多手准备。