动作改善要领 Key Points of Motion Improvement
动作要领 Action Tips
按规范和要领操纵动作 operate ; manipulate ; manage ; handle
要领：动作要连贯，一气呵成。
Main point: the action should be piece together without a break.
动作的要领是，将手置于背部下方，只需抬起头和肩即可。
It requires adopters place hands underneath the back and then only lift head and shoulders.
本文用力学定律分析了弧线球形成的原理，并根据这一原理提出了弧线球的动作要领和训练方法。
This paper analyses the theory of how curve ball is played, and presents the essentials and the way of grasping them.
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