stratus cloud(s)
stratus 修饰 cloud 时，通常用复数形式 stratus clouds，指成片的层云。
Stratus clouds covered the whole valley by noon.
到中午时，层云覆盖了整个山谷。
层云
strati — plural of stratus
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 low-level cloud in the form of a gray, uniform layer, usually not producing precipitation
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.
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。
用法提示：stratus 为不可数名词，指低空均匀的灰色云层。
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。
用法提示：stratus 此处作动词 saw 的宾语，指具体的层云。
Stratus clouds often make the sky look dull and flat.
层云常常让天空显得阴沉而平坦。
用法提示：stratus 用作定语修饰 clouds，表示层云这种云型。
stratus 修饰 cloud 时，通常用复数形式 stratus clouds，指成片的层云。
Stratus clouds covered the whole valley by noon.
到中午时，层云覆盖了整个山谷。
stratus 通常作不可数名词，表示“一层”时用 a layer of / a bank of stratus；其复数形式为 strati。
A thin layer of stratus hung above the hills.
薄薄一层层云悬挂在山丘上方。
也可说 be covered with stratus，强调层云笼罩的状态。
The mountain top was covered by stratus all morning.
整个上午山顶都被层云覆盖。
grammar · medium
易错句子Thick stratuses covered the valley all morning.
正确表达Thick strati covered the valley all morning.
stratus 借自拉丁语，复数按拉丁语规则变为 strati，不能像普通名词那样加 -es（类似 cactus→cacti）。说“许多层云”要用 many strati，而不是 many stratuses。
grammar · medium
易错句子Stratus clouds usually bring heavy rain.
正确表达Stratus clouds usually bring little or no rain.
stratus 指的是低而均匀的灰色层云，通常不伴随降水；带来持续大雨的是另一种云——雨层云 nimbostratus。要表达“下大雨”，应说 nimbostratus 或直接说 it rained heavily，不能把 stratus 当成雨云。
stratum 指岩层、地层或社会阶层这类具体的“层”，是可数名词，复数是 strata；stratus 只作气象术语，指层云。两者拼写相近，但一个属于地质或社会概念，一个是云的种类，不能互换。
nimbostratus 是厚实、颜色暗、会持续降水的雨层云，常带来连绵的雨或雪；stratus 是底部均匀的灰色低云，通常不降水。两者在气象学上是并列的云属，混用会改变“是否下雨”这一关键信息。
cirrostratus 是高空的薄而透明的云幕，常产生日晕或月晕；stratus 是贴近地面、灰暗而不透明的低云层。中文名只差一个字，但高度、厚薄和外观都不同，描述天气时不可替代。
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