extract coal TEF/TCF常用TEF/TCF专四

音标：extract coal发音生词本：添加笔记：

翻译-翻译词典

参考翻译

采煤

其他语句解释

Miners had to dig deeper to extract coal, which became uneconomical.Miners had to dig deeper to extract coal, which became uneconomical.

为了提高产量，矿工不得不向更深处挖掘，这变得越来越不合算。

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