“这是独一无二的事。”水鼠俯身划起桨来，一本正经地说。

"It's the only thing," said the Water Rat solemnly, as he leant forward for his stroke.

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但由于无尾桨系统要耗费更多的发动机功率，性能表现不好。

But the performance is poor because requires more power from the engine.

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涡轮螺桨发动机的无因次性能参数是三个变量的函数。

The"non dimensional"engine performance parameter of turbo propsis a function of three variables.

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