mars up close | 火星大发现
What is Mars like?
火星到底什么样子?
Astronauts have never been to Mars. But robot spacecrafts have. We can learn a lot from them.
Mars is a cold desert world. It has pink skies, orange sunsets, deserts and canyons (峡谷).
- 对本期电子报订户、有效期内的VIP教师会员和本学期初一尊享卡用户,我们开放所有内容:
- 如果您拥有以上权限,请点这里登录;
- 订阅电子报,请点这里;
- 激活VIP教师卡,请点这里;
- 激活21英语尊享卡,请点这里。