计算结果表明，旋转桨叶对直升机机载天线辐射场产生了显著的影响。
The computed results show that the antenna radiation field is interfered severely by the rotating blades.
一个技术难题是气穴现象，一旦发生气穴现象，位于旋转螺旋桨叶后方的低压会产生气泡。
One technical difficulty is cavitation, where low pressure behind a turning blade causes air bubbles.
当船在航行时，被迫通过管道的水旋转一个小型水轮发电机的桨叶，发电机给一组锂离子电池充电。
When the boat is under sail, water forced through the duct turns the blades of a small hydroelectric generator that charges a bank of lithium-ion batteries.
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