translation.en: It's a planet somewhat similar to Earth. It's a little bit smaller, but the land mass on Mars is about the same as the land mass on Earth, you know, if you don't take the oceans into account.
translation.zh: 火星是个类似地球的星球。稍微小一点儿， 火星的组成和地球很相似 火星的组成和地球很相似 如果不算上海洋的话。（火星没有海洋）