The boys have nothing to do but moon around in the streets .
这些男孩子没什么事可做，只是在街上闲荡。
The us space agency plans to use the technology when astronauts return to the moon around 2020.
美国航天局计划在2020年宇航员重返月球时运用这项技术。
Halloween's roots lie in the ancient Celtic festival of Samhain which was celebrated in the British Isles on a full moon around November 1st.
万圣节起源于古代凯尔特人的属阴节（Samhain），生活在英伦列岛的赛尔特人把11月1日左近的一个月圆日定为节日。
Don't just moon around in the holiday. You can find something meaningful to do.
假日不要游手好闲。你可以找一些有意义的事情来做。
The boys have nothing to do but moon around in the streets.
这些男孩子没什么事可做，只是在街上闲荡。
What does the orbit of the Moon around the Sun look like?
月球绕太阳的轨道是什么样的呢？
The speed of the Earth around the Sun is about 30 times the speed of the Moon around the Earth.
地球绕行太阳的速度大约是月球绕地球的30倍。
In particular, the speed of the Moon around the Sun will never be negative, so the Moon will never loop backwards.
特别是月球绕行太阳的速度决不可能是负的，所以月球永远不会向后打转。
That means that the speed of the Moon around the Sun will vary between about 103% and 97% of the speed of the Earth around the Sun.
这就意味着月球绕行太阳的速度的改变范围是在地球绕行太阳速度的97% ~ 103%范围之间。
Since the eccentricities are small, we can assume that the orbits of the Earth around the Sun and the Moon around the Earth are both circles.
由于偏心率小，我们假定地球绕太阳的轨道和月球绕地球的轨道都是圆形。
Since the eccentricities are small, we can assume that the orbits of the Earth around the Sun and the Moon around the Earth are both circles.
由于偏心率小，我们假定地球绕太阳的轨道和月球绕地球的轨道都是圆形。
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