在构造函数体现执行前，用初始化列表中指定的值初始化成员。

The members are initialized to the values specified in the initializer list before the body of the constructor executes.

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在构造函数体现执行前，用初始化列表中指定的值初始化成员。

The members are initialized to the values specified in the initializer list before the body of the constructor executes.

youdao