When shake reach to some intensity in some direction, frequency and extent, people will have serious bad reaction.
当震动在一定方向和频率、幅度内达到一定强度时，会导致人体产生较严重的生理不良反应。
When shake reach to some intensity in some direction, frequency and extent, people will have serious bad reaction.
当震动在一定方向和频率、幅度内达到一定强度时，会导致人体产生较严重的生理不良反应。
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