coal excavator的用法和樣例：
例句
- The purpose of inviting you to come here is to discuss the purchase of some long wall coal cutters.
這次請您來(lái)想談?wù)勯L(cháng)臂采煤機的進(jìn)口問(wèn)題。 - The reserves of thin coal seam shearer and the developing trend of coal seam shearer of our country are analysed.
分析我國薄煤層儲量以及薄煤層采煤機的發(fā)展狀況及趨勢。
