构造辅助函数是利用微分中值定理解决问题的关键，构造辅助函数的方法较多。
Constructing auxiliary functions is the key in using differential mean value theorem to solve problems; there are many methods for constructing auxiliary functions.
第二个辅助构造函数只接受一个标签。
ButtonWithCallbacks定义了两个方便用户使用的辅助构造函数。
ButtonWithCallbacks defines two auxiliary constructors for the user's convenience.
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