云底高度为零,视野限制在50英尺(15米)或以下
云底高度为零,视野限制在50英尺(15米)或以下
Of a cloud ceiling, limiting vision to 50 feet (15 meters) or less.
水平能见度限制在165英尺(50.3米)或以下
Of horizontal visibility, limited to 165 feet (50.3 meters) or less.
在抽象层面存在但在表面形式上未实现
Present at an abstract level, but not realized in the surface form.
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