皮层极性决定主轴方向和位置。

Cortical polarity determines spindle orientation and position.

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在此居住过，它定义的方向和位置的几乎所有活动。

In this residence too, it defines the orientation and location of nearly all activities.

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无论切削发球或平击发球，都要学习能以相同的托球位置，发往不同的方向和位置。

Work on being able to hit the slice and the flat serve off the same toss in different directions.

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