一旦旗子被动过，由于月球没有大气，也就没有了空气阻力，它反而要过很久才能停下来。

When it is set in motion, the lack of atmosphere and hence air resistance mean the flag takes a long time to settle.

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方法让患者分别进行健侧和患侧拇指被动运动、主动运动和加阻力下的主动运动。在患者运动时行功能磁共振（F MRI）检查，观察上述不同运动形式下大脑半球相关区域血氧水平的变化。

Methods Four stroke patients with hemiplegia were involved in this study During the examination by F MRI, these patients were asked to move thumbs in passive, active and overcoming resistance fashion.

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