positive motion cam 确动凸轮
positive motion plate cam 确动平板凸轮
positive-motion gear 正运动配汽机构
positive motion disk cam 确动盘形凸轮
positive motion cylindrical cam 正运动圆柱形偏心轮
Sports are the effective means to promote university students' psychological health. It is beneficial to develop intelligence, cultivate positive motion, mould personality spirit.
体育运动是促进大学生心理健康的有效手段，它有助于智能的开发，积极情绪的培养，人格精神的塑造。
The slow-motion shock seems irresistible today, but in time it will give rise to an equally unstoppable and more positive slow-motion reaction (see article).
慢动作的冲击在今天看来是不可避免的，但是他却及时地产生了同等的不能停止的和更加积极的慢动作反应的行为。
A nonaction may be an "action" in a praxeological sense, but it sets no positive chain of consequences into motion, and therefore cannot be an act of aggression.
从行动学的意义上看，不行动也可能是 “行动”的一种，但它却完全无法引起后续结果，所以不构成侵权行为。
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