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to have more than one interest, skill, or resource that you can use if you need to
还有一手;有两手准备
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。