名词
中文翻译：煤炭黑
同义词：
['black coal', 'black ash例句：1. The coal-black walls of the cave were so dark that it was hard to see anything.（洞穴的煤黑色墙壁如此黑暗，以至于很难看到任何东西。）']
例句：
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1. The coal-black walls of the cave were so dark that it was hard to see anything.
洞穴的煤黑色墙壁如此黑暗，以至于很难看到任何东西。
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2.The coal-black smoke from the factory hung in the air for hours.
工厂的煤黑色烟雾在空气中持续了数小时。
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3.The coal-black soil is rich in minerals and nutrients.
煤黑色的土壤富含矿物质和养分。