screw-back的意思|示意

Watch precision screw fixed case back to ensure that at depths of 50 meters under the water still has a good feature.

手表的底盖用精密螺丝固定，保证在水深50米下仍具有良好的防水功能。

The back part of the supporting rack is provided with a positioning bracket, and the positioning bracket is provided with a positioning screw bolt.

支撑架背部设有定位支架，定位支架上设有定位螺杆；

In normal use, non spiral crown should push the crown back to the original position, the crown screw thread to prevent water infiltration.

正常使用中，非螺旋式表冠应将表冠按回原始位置，螺纹表冠应旋紧以防止水渗入。

Designed to prevent the flow of contaminated water back into the potable water supply, these devices require no plumbing changes, and screw directly onto a sill cock.

其功能在于防止污染水回流到饮用水供应系统中，这些装置不需要对改变管线，只需要直接螺纹旋在洒水龙头上即可。

At the same time with the screw pump, screw and screw with each other form a sealed cavity between one another to ensure airtight, otherwise there may be liquid from the gap in the back to go back.

同时螺杆与泵体、螺杆与螺杆间又相互形成密封腔，保证密闭，否则就可能有液体从间隙中倒流回去。

The back guy, the mooring rope, take the thing, to twist the screw even to turn around and so on the ground easy movement, appears in weightlessness outer space is slow and is slow.

拉线、系绳、取物、拧螺丝甚至转身等在地面轻而易举的动作，在失重的太空显得缓慢而迟钝。