银河系内离银心约3000pc处的一条旋臂，因以约53km/s速度离银心向外作膨胀式运动而得名。
当膨胀臂被激光加热时迅速伸长，由于自身的惯性，移动滑块基本上保持静止。
While being heated by a laser beam, expansion arm extends rapidly, and the motion block remains still due to its own inertial.
宇航服紧的像完全膨胀的血压计臂带，但是压力是围绕全身的，而不是在手臂上的。
While suits for spacewalks are about as tight as a fully inflated blood pressure cuff, the GLCS suit exerts about the same amount of pressure as a pair of Lycra riding pants.
该星系组中的引力作用给我们留下了明显的信号，其中包括NGC 3628扭曲膨胀的星系盘和M66拉长的螺旋臂。
Gravitational interactions between galaxies in the group have also left telltale signs, including the warped and inflated disk of NGC 3628 and the drawn out spiral arms of M66.
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