管道水下穿越所通过的水域由于河床的变化而给管道的安全运行带来隐患。
Hidden dangers to safe operation of pipelines will result from changes of riverbed in the waters where pipelines underwater cross.
水下穿越管线采用全断面沟埋敷设于河床稳定层内，确保了穿越管段的安全。
The under water pipelines were laid into the stable bed by ditch burying of full cross-sectional area to ensure the safety of underwater pipelines.
这里进行的是水下障碍物项目，挑战者必须屏住呼吸穿越冰冷的泥潭。
There is an underwater obstacle section. Participants have to hold their breath and make their way through the muddy, freezing water.
每个潜艇都将有一两个驾驶员在艇上使用踏板或其他推动系统来引导他们的船最快地穿越水下328尺（100米）的比赛航程。
Each sub will have one or two pilots onboard who use pedals or some other propulsion system to guide their vessel across the 328-foot (100-meter) submerged racecourse the fastest.
机器人可以比人类更容易地到深水中去，机器人一次可以在水下呆好几天，并且能穿越几百公里去探索海洋。
These robots can travel deep underwater far more easily than people. Robots can stay underwater for many days at a time and travel hundreds of kilometers exploring the oceans.
机器人可以比人类更容易地到深水中去，机器人一次可以在水下呆好几天，并且能穿越几百公里去探索海洋。
These robots can travel deep underwater far more easily than people. Robots can stay underwater for many days at a time and travel hundreds of kilometers exploring the oceans.
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