This theory is the basis of a famous thought experiment known as the twin paradox, in which a twin sibling who travels on a fast-moving rocket ship would return home younger than the other twin.

这个理论基础来自于著名试验猜想，双胞胎悖论：乘坐高速火箭飞船旅行的双胞胎哥哥（或弟弟），回到家后要比他的弟弟（或哥哥）年轻。

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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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The paper describes the design of twin screw river passenger ship, as well as the performance, speed in shallow water, stability, floating condition and the results on trial.

本文就双桨双甲板客船的总体设计、性能特点、对浅水航速、稳性及浮态等问题以及实船试航作了介绍。

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It envisions a behemoth mother ship with twin, narrow fuselages, featuring six Boeing Co. 747 engines attached to a record 385-foot wingspan, plus a smaller rocket pod nestled underneath.

WSJ: Microsoft Co-Founder to Build Massive Jet for Space Launches