而且，随着大流行病在国内和国际上波浪式相继传播，病毒的内在毒力可能会逐渐发生变化。
In addition, the inherent virulence of the virus can change over time as the pandemic goes through subsequent waves of national and international spread.
在本例中，不断变化的波浪也是我们拍摄的一部分内容。
塌岸破坏主要取决于水力作用、波浪冲击、水的浸泡、水位升降、河势变化等。
The destruction to the collapsed bank principally depends on water power, shock of wave, water soak, changes of water level and river topography and so on.
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