多年来，牛顿一直对月球和行星绕轨道运行的原因感到好奇。
Newton for years had been curious about the cause of the orbital motion of the moon and planets.
他们正使用地面仪器以及绕轨道运行的仪器如哈勃太空望远镜和斯皮策太空望远镜检查这些候选恒星。
They're checking out the candidates with ground-based instruments as well as orbiting assets like the Hubble Space Telescope and the Spitzer Space Telescope.
你汽车上与绕轨道运行的卫星发出的无线电信号调谐的传感器能随时精确地确定你汽车的方位，并告知交通阻塞情况。
Sensors in your car tuned to radio signals from orbiting satellites can locate your car precisely at any moment and warn of traffic jams.
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