secondary shaft meaning in Chinese
第二轴
辅助井筒
Examples
- Was cut a secondary shaft back out for air
应该是建一个二级通风孔来获取空气 - Was cut a secondary shaft back out for air . .
应该是建一个二级通风孔来获取空气. . - Was cut a secondary shaft back out for air . .
应该是建一个二级通风孔来获取空气. .
第二轴
辅助井筒