To avoid any harm to hands by a sudden close of the upper cover, a fall down damping device is added to the turning mechanism, force the upper cover close slowly.
使上盖可以缓慢下落，从而可以避免上盖猛烈下落时对人手的伤害；
To avoid any harm to hands by a sudden close of the upper cover, a fall down damping device is added to the turning mechanism, force the upper cover close slowly.
使上盖可以缓慢下落，从而可以避免上盖猛烈下落时对人手的伤害；
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