...tor*过：const Rational operator*(const Rational& lhs, const Rational& rhs); 你可以看到，左手操作数（left-hand operand）a 在函数内部以 lhs 的面目出现，而右手操作数（right-hand operand）b 以 rhs 的面目出现。
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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。
Because the operator returns its left-hand operand, we can combine a sequence of input requests into a single statement.
由于输入操作符返回其左操作数，我们可以将输入请求序列合并成单个语句。
The important thing to keep in mind is that if the left-hand operand is dereferenced, then the value pointed to is changed.
谨记区分的重要方法是：如果对左操作数进行解引用，则修改的是指针所指对象的值；
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