The dot operator fetches its right-hand operand from its left.
点操作符通过它的左操作数取得右操作数。
In particular, the operators return their left-hand operand as their result.
尤其是，这些操作符返回左操作数作为运算结果。
Additional assignment operators that differ by the type of the right-hand operand can be defined for a class type.
可以为一个类定义许多附加的赋值操作符，这些赋值操作符会因右操作符类型不同而不同。
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