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。
The pure quartz shake circuit with a high stable performance to the frequency.
全部采用石英振荡电路，具有极高的频率稳定性能。
The pure quartz shake circuit with a high stable performance to the frequency.
全部采用石英振荡电路，具有极高的频率稳定性能。
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