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。
Seal air is injected into the labyrinth seals located at the main motor shaft (top and bottom) and at the pinion shaft driving the motor.
密封空气被注入到主马达轴（顶部和下部）和驱动马达的齿轮轴的迷宫式密封里。
It is the first that the application of PLC to the loading system for the bottom of main shaft in our mine.
PLC在我国矿主井底装载系统中的应用还属首次。
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