当雨云移动时，降雨的化学成分略有变化。
The chemical composition of rainfall changes slightly as raid clouds move.
刚起飞时，他们就遭遇了中度至重度的气流，不断堆积的积雨云和一场酝酿中的雷暴，而Frank直接飞了进去。
As they encountered moderate to severe turbulence, towering cumulonimbus clouds and a developing thunderstorm just offshore, Frank flew directly into it.
当接近积雨云时，我们目视看见两个主体云间有20 公里的间隙，但是没想到穿越时遭遇强风和冰雹袭击。
When approached the cumulonimbus , we could see by eyes there was a space of about 20km between the two major clouds.
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