slate + colour word (slate blue, slate grey)
slate 常与 blue、grey 等颜色词连用，组成表示具体色调的复合颜色词。
She chose a slate blue dress for the wedding.
她为婚礼挑了一条石板蓝的连衣裙。
具有板岩的蓝灰色；石板色的
having the bluish-grey colour of slate
具有板岩的蓝灰色
Having the bluish-grey colour of slate (noun etymology 1, noun sense 4).
The artist painted the sky a soft slate colour.
艺术家把天空画成了柔和的石板色。
用法提示：slate 在此作形容词，修饰 colour，表示石板般的蓝灰色。
Dark slate clouds gathered above the sea before the storm.
暴风雨来临前，深石板灰色的云聚集在海面上空。
用法提示：slate 在此作形容词，修饰 clouds，描述云呈现石板般的蓝灰色。
She chose a slate dress for the evening party.
她为晚宴挑选了一条石板灰色的连衣裙。
用法提示：slate 在此作形容词，修饰 dress，说明裙子是石板蓝灰色。
slate 常与 blue、grey 等颜色词连用，组成表示具体色调的复合颜色词。
She chose a slate blue dress for the wedding.
她为婚礼挑了一条石板蓝的连衣裙。
作定语直接修饰名词，多用于描写天空、眼睛等事物的颜色。
Rain clouds gathered in the slate sky.
雨云在灰蓝色的天空中聚集。
作表语时常见于描写天空、海面等自然景物的颜色。
The sea looked slate in the early morning light.
清晨的光线下，大海看上去一片灰蓝。
grammar · medium
易错句子She bought a slate grey color dress.
正确表达She bought a slate grey dress.
汉语说“××颜色”，容易把“颜色”直译成 color/colour 跟在颜色词后面。英语里 slate grey 这类颜色词本身就是形容词，后面再加 color 属于重复搭配，不合语法。
grammar · medium
易错句子The bedroom walls were painted in a slate.
正确表达The bedroom walls were painted in slate.
表示“石板灰、蓝灰色”这一颜色时，slate 是不可数用法，不能加不定冠词 a。加上 a 就变成可数名词，意思是“一块石板、一份名单”，与想表达的蓝灰色不符。
石板灰；蓝灰色
The sky turned slate grey before the storm.
暴风雨来临前，天空变成了石板灰色。
石板蓝；蓝灰色
She painted the bedroom walls slate blue.
她把卧室墙壁刷成了石板蓝色。
石板色的；蓝灰色的
He wore a slate-coloured suit to the interview.
他穿了一套石板色的西装去面试。
石板灰色的天空
A slate grey sky hung over the city all afternoon.
整个下午，石板灰色的天空笼罩着这座城市。
蓝灰色的眼睛
The child had striking slate blue eyes.
那个孩子有一双引人注目的蓝灰色眼睛。
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