This paper investigates the turning motion of a twin propeller twin rudder ship in regular waves.

本文研究了双桨双舵船在规则波中的回转运动。

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There is a saying that goes, "A soul without a high aim is as a ship without a rudder".

俗话说：“心无远大志，犹如船无舵”。

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You're out in the world, adrift, a ship without a rudder.

你来到这个世界上，随波逐流，是一只没有舵的船。

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The Japanese say the powerboat repeatedly came very close to the factory ship, the Nisshin Maru, while activists tried to entangle its rudder and propeller with a rope.

VOA: standard.2010.01.06

Beijing has long been anticipating the ice chunks and subtly adjusting the rudder around inflation without steering the economic ship too far off course.

FORBES: Chinese Dragon Still Snorting Loudly

These are similar to the azimuth thrusters already used on some vessels: propellers on pods that can be rotated to push the ship in different directions, making a rudder unnecessary.

ECONOMIST: Marine technology: A voyage of discovery | The