The constructor initializer is a list of member names, each of which is followed by that member's initial value in parentheses.
构造函数的初始化式是一系列成员名，每个成员后面是括在圆括号中的初始值。
The constructor initializer is a list of member names, each of which is followed by that member's initial value in parentheses.
构造函数的初始化式是一系列成员名，每个成员后面是括在圆括号中的初始值。
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