常见例句Conedera operations, goes down the mine on the need for reliable security measures against a well-bucket bottom. 孔内作业时，上下井必须有可靠安全保障措施，严禁乘坐吊桶上下。CONEDERA, Juan Gerardei 胡安·赫拉尔迪·科内德拉 返回 Conedera