Marine propellers, Aluminium castings, O …

船用螺旋桨；铝铸件；氧气。

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To meet the needs of Marine energy saving support wrappings are added to tail shafts which are in the ships with double propellers or more than two propellers.

为满足船舶节能需要，可对双桨和多桨船舶采用加装艉轴支架包壳的方法。

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They are criticized for being potentially harmful to marine life, but Mortimer contends that because the turbine's propellers move relatively slowly, the impact on fish and other forms of sea life is minimal.

CNN: Tide turns towards undersea energy