这标志着三个月以来的第二次衰减。

That marked the second decline in three months.

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通过具体的计算发现，由撞击带来的直接效应是有限的，在短时间内会迅速衰减，但由此引发的二次效应却是十分显著的。

Based on the calculation of our model, we find that the direct effects of the impact are limited and will attenuate in a short time.

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这二次实测，一次为波浪成长阶段，而另一次为波浪衰减阶段。

The two measured wave data was once a wave generation stage, and another time a decay stage.

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