coal pit的用法和樣例：
例句
用作名詞 (n.)
- The country is short of known deposits of coal.
這個國家缺少已知的煤礦礦床。 - He sketched the coal miner in a few minutes.
他幾分鐘就畫了一幅那位煤礦工人的素描。 - These are mine workers of a small coal mine in north-east of Yunnan.
雲南滇東北部的小煤窯的礦工們。 - The coal shortage during the storms has led to some arguing for reopening unsafe mines.
雪災來臨之時，有些人又提出要重新開放那些不安全的煤窯。
