under water navigation
水下航行
以上为机器翻译结果，长、整句建议使用 人工翻译 。
The problems of under water navigation by mine roller tram are discussed.
分析了矿山水下轮式采煤车的定位定向导航的可实现问题。
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The exercises train U.S. submarine crews to deal with craggy ice keels that extend 20 to 50 feet into the water, and varying salinity levels that complicate communications and navigation under the ice cap.
FORBES: U.S. Navy Scrambles for Piece of Arctic Pie
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