If the jamb - mine isn't exploited, the economic benefit will go down rapidly.如果不采矿柱矿山经济效益将急剧滑坡.Many men including Jamb volunteered to help.许多人包括杰可伯都自愿帮忙.They would linger at the jamb of the door.他们就在门旁侧壁那呆着不走.the e...
They would linger at the jamb of the door.他们就在门旁侧壁那呆着不走.If the jamb - mine isn't exploited, the economic benefit will go down rapidly.如果不采矿柱矿山经济效益将急剧滑坡.Many men including Jamb volunteered to help.许多人包括杰可伯都自愿帮忙....