Each is a transparent sheath of plastic 17-metres long, mostly underwater, held in place by a floating collar.
每个都是17米长的塑胶套子，大部分淹没于水下，由一个浮动的环状装置固定住。
In the dissertation, the design about reality and cleaning device and controlling system of the Underwater Ship face cleaning Robot has mostly been fulfilled.
本文主要完成水下船体表面清刷机器人的本体、清刷装置和控制系统设计，并对清刷机器人的位置检测方式进行研究。
The underwater high-speed vehicle surfaces are enveloped by cavity entirely or mostly, which reduces skin friction drag and allows the vehicle to obtain high speed.
水下超高速航行体的全部或大部分表面被空泡包裹，使其阻力显著降低而达到高速航行的目的。
Railway tunnels are divides into mountain railway tunnel, city railway tunnel and underwater railway tunnel. This chapter introduces mostly the first kind of railway tunnel.
铁路隧道分为山岭铁路隧道、城市铁路隧道及水底铁路隧道，本章主要介绍第一类铁隧。
Railway tunnels are divides into mountain railway tunnel, city railway tunnel and underwater railway tunnel. This chapter introduces mostly the first kind of railway tunnel.
铁路隧道分为山岭铁路隧道、城市铁路隧道及水底铁路隧道，本章主要介绍第一类铁隧。
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