掌过舵的人都知道，当洋流从多个方向推动一条船舶的时候，想要维持其航线是多么的困难。

Anyone who has steered a boat knows how much effort is needed to keep the boat on course when currents are pushing it in different directions.

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因为导弹没有稳定或控制翼面，它完全地依靠在第一级发动机的摆动喷嘴去维持它的飞行航线。

Because the missile does not have establishing or controlling surfaces, it completely relies on the swinging nozzles of its first stage engine to maintain its course of flight.

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