降雨强度与雨滴大小、数量及雨滴密度有关。
The rainfall intensity is relevant with raindrop size and quantity as well as rainfall density.
如果雨滴大小恰到好处，第一个红色多余环会叠加在主环的深蓝环上，红加蓝等于紫色！
And if the drops are the right size, the first red supernumerary ring can overlap significantly with the main dark blue ring, and what do red and blue give? Purple!
最恶劣的乱流还伴有雷暴雨，肉眼或天气雷达可以发现。天气雷达可以估测出雨滴的大小。
The worst turbulence is associated with thunderstorms and they are visible to the naked eye or with weather radar which picks up the size of water droplets.
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