一般手机号要绑定银行卡，让持卡人随时随地知道银行卡里的金额，但手机号有时候会换。银行卡绑定的手机号怎么改？我们来看介绍。
I want to store some user preferencesWould Enum be a good datastructure to store 开发者_C百科them? If so, how do I do it? This is the final usage of the datastructure.
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