研究星球和天体。

Study the stars and the sky.

youdao

这周，我们讲述这个星球上令人惊讶的天体运动。

This week, we tell about the planet's surprising motion among the stars.

youdao

这周，我们讲述这个星球上令人惊讶的天体运动。

This week, we tell about the planet's surprising motion among the stars.

youdao