1. A Russian space capsule is currently orbiting the Earth. 一个俄罗斯太空舱目前正环绕地球飞行。
2. Our galaxy is so huge that dozens of lesser galaxies scamper about it, like moons orbiting a giant planet. 我们的银河系实在庞大，吸引着数十个较小的星系环绕着它奔跑，恰似环绕巨大行星旋转的卫星。
3. But such transits have paved the way for what might prove to be one of the most vital breakthroughs in the cosmos—detecting Earth-sized planets orbiting other stars. 但是这样的凌日现象已经为被证明可能是宇宙中最重要的突破之一的说法铺平了道路，这个说法即找到那些围绕其他恒星轨道公转的和地球大小相似的行星。
4. That's about how high an object would have to be orbiting straight up from the equator to constantly remain directly above the exact same spot on the rotating planet Earth. 这大约是一个物体从赤道沿轨道垂直向上运行的高度，这样它就可以一直保持在地球同一地点的正上方。
5. Denverites often kvetch about sleep disrupted by the Denver Police Department's helicopter orbiting overhead. 丹佛人经常抱怨他们睡觉的时候会受到头顶上方盘旋的丹佛警察局的直升飞机的干扰。
