当作用时间较长时，碳粉会发生无定形化。

Amorphism can occur when carbon powders are refined further.

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当头盘系统发生碰撞时，冲击激励峰值加速度与作用时间的倒数之间具有近似线性关系。

When the head disk collision occurs, the peak acceleration of the shock pulse approximately follows a linear relationship with the inverse of the excitation duration.

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结果微波明显抑制了A549细胞的活力，并诱导A549细胞发生凋亡，辐射效果与辐照剂量、作用时间相关。

Results Microwave obviously inhibited the activity and inducted the apoptosis of A549 cells. Time dependence and dose dependence were definite.

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