If the second operand is a Point, the method should return a new Point whose x coordinate is the sum of the x coordinates of the operands, and likewise for they coordinates.
如果第二个运算数是一个Point，该方法就应该返回一个新的Point，新点的横纵坐标分别为两个点坐标相加。
If the second operand is a Point, the method should return a new Point whose x coordinate is the sum of the x coordinates of the operands, and likewise for they coordinates.
如果第二个运算数是一个Point，该方法就应该返回一个新的Point，新点的横纵坐标分别为两个点坐标相加。
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