一种浓密、平底状的白色云块，有一个多重圆形的顶部和界线分明的轮廓，通常是由不稳定的热气团上升形成的。
A dense, white, fluffy, flat-based cloud with a multiple rounded top and a well-defined outline, usually formed by the ascent of thermally unstable air masses.
不管有没有梅雨锋的出现，从印度到库克群岛，日食路径都已嵌入潮湿和不稳定的气团中。
With or without the presence of the mei-yu front, the eclipse path is embedded in a humid and unstable airmass from India to the Cook Islands.
影响洞内滴水的稳定同位素组成的因素主要是年平均气温、年降雨量以及降水气团的来源的变化。
The major factors that influence isotopic composition of cave drip water are mean annual air temperature, mean annual rainfall and change in moisture source.
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