shaft bottom plan [测] 井底车场平面图
shaft bottom [矿业] 井底 ; 井底车场
bottom shaft wheel 下轴齿轮
elevator bottom shaft bush 升降机轴衬
bottom box shaft 底梭箱轴
main shaft on bottom 主要竖井的底部 ; 主井底部 ; 主轴底部
But when divers moved into the mine early on Friday the body of the first miner was discovered at the bottom of the main shaft.
但是当潜水员在周五早些时候向矿井靠近的时候，第一具尸体是在坑道的底部发现的。
They worked with hand trowels, a plywood form for lining the shaft with concrete, inch by inch, and a sturdy hand-built crank for lowering a man to the bottom and sending up buckets of sand.
他们的作业工具是：挖土用的手工泥铲、浇筑混凝土井壁用的胶合板模板、还有手工制作摇杆。 摇杆将一个人送到井底，那个人就在井底一点点挖土然后再通过摇杆把沙子一桶桶送到地面。
Pump shaft seals use mechanical seal, pump top and bottom, respectively, equipped with water injection plug and the drain plug.
泵的轴封采用机械密封，泵体顶部和底部分别装有注水、放泄的螺塞。
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