The engines used by Ark Angel are electric motors driving counter-rotating propellers, mounted in pods below the hull.
方舟天使使用的引擎是反向旋转的螺旋桨驱动的电动马达，安装在船体下的分离舱中。
One way to increase the efficiency of a high-bypass jet engine is to turn the fan into an open rotor, a bit like returning to propellers, but using two rings of stubby counter-rotating blades.
提高高旁通飞机引擎的方法之一就是把风扇变成开放式旋翼，有点回归于螺旋桨的味道，但要使用两圈粗短的反旋桨叶。
"Most seals are very wary of propellers," she says. "But the seals may have been caught in the draft of a powerful current, and been dragged through a rotating blade."
“大多说海豹是会小心躲避螺旋桨的，”她说，“但他们可能会被强大的水流卷进螺旋桨中。”
He saw no fire or smoke during the flight and he believed both propellers were rotating.
他没有在飞行过程中看到火或烟，他认为螺旋桨在旋转。
He saw no fire or smoke during the flight and he believed both propellers were rotating.
他没有在飞行过程中看到火或烟，他认为螺旋桨在旋转。
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