coal seam methane content的用法和樣例：
例句
- This study provides a scientific method about studying the gas content of the coal seam unmined and provides the basic data about the safe mining.
這為未開採煤層瓦斯含量的研究提供了科學方法，並為該煤礦的安全開採提供了基礎資料。 - Under gassy coal seam condition, the full-heading development is employed.Because of the fast heading a high rate of gas emission arises.
在瓦斯含量較大的煤層採用綜掘掘進巷道，由於掘進速度快，出現了瓦斯湧出量過大的現象。
