A member initializer that specifies a collection initializer after the equals sign is an initialization of an embedded collection.
在等号后指定集合初始化器的成员初始化器是对内嵌集合的初始化。
When an array is in a constructor's member initialization list, the elements of the array will be default initialized.
当阵列在建构函式的成员初始设定清单中时，阵列元素将预设为初始化。
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