Grammar Note
可数名词，指层云
层云
先理解核心含义，再看它在真实句子里的用法。
层云
a low-level cloud in the form of a gray, uniform layer, usually not producing precipitation
A low layer of stratus covered the coast all morning.
整个早晨，一层低低的层云笼罩着海岸。
一种主要的低云类型,呈灰色层状,底部相当均匀,通常不伴随降水,能产生华盖现象和微弱的均匀亮度。
A principal, low-level cloud type in the form of a gray layer with a rather uniform base, usually not associated with precipitation, and capable of producing corona phenomena and a weak, uniform luminance.
The pilot saw stratus below the plane and decided to climb above it.
飞行员看到飞机下方有层云，决定爬升到云层之上。
Stratus clouds often make the sky look dull and flat.
层云常常让天空显得阴沉而平坦。
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可数名词，指层云
页面下方列出了常见词形变化。学习时注意它们在句子中的语法位置。
Dictionary facts from ECDICT, WIKTIONARY, WORDNET.