坐姿书写示范 Sitting posture【书法教程ChineseCalligraphy Tutorial for Beginners】

悬肘书写很难吗？坐姿书写详细示范。悬肘、悬腕、枕腕各有什么优缺点呢？Writing with elbow hanging in the air, wrist hanging in the air, and wrist pillowed. What's the pros and cons of each posture? Please
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