But instead of just sticking to the dull but profitable business of keeping the engine of Germany's economy turning, IKB turned its hand to dabbling in America's housing markets.

但是代替这种愚钝行为的是以完全盈利的产业作为德国经济扭转的引擎，IKB就已开始涉足美国的住房市场。

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Wallis said:" They are one of the safest machines to fly because, if the engine stops, the rotors keep turning and you can land."

沃利斯称：“驾驶旋翼飞机很安全，即使引擎停转，旋翼还会继续转动，所以可以安全着地。”

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He is turning the engine over.

他正在发动引擎。

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At 80 mph, the engine is turning about 1, 800 rpm (redline is 4, 500 rpm).

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Then they realized people would have to fly without the reassuring blur of propellers turning and dropped the jet engine like a hot potato.

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