Do when crouching start shipment to move , if rate is too rapid , the frequency is too much , perhaps use erupt force and rebound strong , can hurt knee joint.

做蹲起运动的时候，假如速度太快、次数太多，或者用爆发力和反弹劲儿，就会伤到膝关节。

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The magnetic mechanical engineering technology is to use the new permanent magnetism materials to get the strong permanent magnetic field force.

磁机械工程技术它是利用新型永磁材料，获得强大的永磁场力。

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Therefore, it is necessary to use the centrifuge to produce a strong centrifugal force, in order to force these particles to overcome the proliferation of the settlement movement.

所以需要利用离心机产生强大的离心力，才能迫使这些微粒克服扩散产生沉降运动。

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