Stratus. These low-lying clouds "can give you a strangely claustrophobic feeling." When a stratus cloud forms at a very low level, it is called fog or mist.
层云。这种低垂的云彩“会让你产生一种奇特的幽闭感。”当层云在很低的水平面形成时，它通常被称作雾气。
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For example, if you specify that a given node should be rendered with depth fog, then its children will also be rendered with depth fog, unless you explicitly override at the child level.