When it was necessary, the submarine came inside that camera, workers lowered the waterlevel and started the repairing of the submarine.
当有必要的时候,潜艇会进入那个暗室,工人将水位降低,然后开始对潜艇进行维修。
2
Due to groundwater pumping the waterlevel is lowered, the buoyancy in covering soil is decreased, the hydraulic gradient and flow velocity are increased, and the corrosion is enhanced.
抽汲地下水降低了地下水位,使上覆土层浮托力减小,水力坡度和流速增大,潜蚀作用加强。
3
This enables the shafts to be lowered into the tank and to operate at the normal waterlevel.