Prove some inequalities involving a moving-point on the plane of triangle with it′s distance coordinates.

利用三角形的重心坐标，证明涉及三角形平面上一动点的一些不等式。

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So, think of a line as the trajectory of a moving point.

把直线看作运动点的轨迹。

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Line is the mark made by a moving point, such as a pencil or brush.

线是由动点构成的，如铅笔或笔刷。

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At the same time he was a master of point-to-point navigation, moving not by plan but by instinct, tempered by experience.

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