When one of the input cells changes, all the cells that depend on it need to react to that change — the aforementioned reactivity. In practice, though, this is the bare minimum requirement. When building reactive systems, there are usually some additional requirements we impose that make the problem harder:
Фото: Sarah Meyssonnier / Reuters。新收录的资料对此有专业解读
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Or, if you don't care that much: If it starts with a 3, it's a，更多细节参见新收录的资料
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