冥想天 开发者_StackOverflow社区 2021-09-13 08:32 自己耕种的，这是我们一暑假的，现在行情价是十元一斤的太子油，这是自己耕种的，然后十斤菜籽油就是100元，然后还要配单一个连桶铁桶，那我们就算最低的成
I want to write an application that allow user to count down the time. The time will be displayed using label. I want to update the label every second, how can I do it? or which API is suitable for me
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