The Moon is Earth's closest neighbor in space.
月亮是地球在太空中最近的邻居。
It moves around the Earth in a path called an orbit.
它沿着一条叫做轨道的路径绕地球运行。
This movement is called "revolution."
这种运动叫做“公转”。
The Moon takes about 27 days to go around the Earth once.
月亮大约 27 天绕地球转一圈。
As the Moon moves, its shape looks different in the sky.
当月亮运动时，它在天空中的形状看起来不同。
This is called the "lunar phases" or "moon phases."
这被称为“月相变化”。
The Moon does not make its own light.
月亮本身不会发光。
We can see the Moon because it reflects sunlight.
我们能看到月亮，是因为它反射了太阳光。
The shape of the Moon we see depends on how sunlight hits it.
我们看到的月亮形状取决于阳光照射的角度。
When the Moon is between the Earth and the Sun, we cannot see it.
当月亮在地球和太阳之间时，我们看不到它。
This is called the "New Moon."
这被称为“新月”。
As the Moon moves, we start to see a small bright part.
随着月亮运动，我们开始看到一个小的亮面。
This grows bigger until we see a full circle.
这个亮面会变大，直到我们看到一个完整的圆形。
This is called the "Full Moon."
这被称为“满月”。
After that, the bright part gets smaller again.
之后，亮面又会慢慢变小。
The Moon keeps changing shape in a cycle every 29.5 days.
月相大约每 29.5 天循环变化一次。
The Moon’s gravity also affects the Earth.
月亮的引力也会影响地球。
It helps create ocean tides.
它会导致海洋的潮汐现象。
Now you know that the Moon orbits the Earth and its shape changes because of sunlight!
现在你知道月亮绕着地球转，并且它的形状变化是因为阳光的照射角度不同了！
