工厂生活需要一个更严格的时间表，在那里，工作在铃声中开始，工人让机器以恒定的速度保持运行。
Factory life necessitated a more regimented schedule, where work began at the sound of a bell and workers kept machines going at a constant pace.
要留在轨道上，一个物体必须以恒定的速度运行于地球表面。
To stay in orbit, an object must be traveling at a constant speed over Earth's surface.
通过对不同时期拍摄的图片的对比，科学家就可以推断出那些是恒定的遥远银河系，从而专注于研究按轨道运行的彗星。
By comparing photos taken at different times, scientists can subtract out objects that appear stationary, like far-off galaxies, and focus on things that appear to be moving in orbits, like asteroids.
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