采矿里的decline是什么意思 比如:The main hoisting decline was driven at an inclination of 14° below horizontal on the hangingwall side of the orebody for a horizontal distance of 850m at 5.5m×2.7m using ST5B scooptrams for lashing. 这里我觉得应该是井之类的意思。。。专业人士指点一下。。。