small coal
英 美
I found a small coal black bird in the grass.
我在草丛中发现了一只黑色的小鸟。
The application of simple hydraulic prop in the face of small coal mine is expounded.
阐述了单体液压支柱在小型煤矿工作面支护中的应用。
The biggest push concerns small coal mines, in which thousands of workers perish every year.
最大的推动力是关于小煤窑的，每年有几千人因它死亡。
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