分类：地球
We currently call only one planet home. Will we be the cause of its improvement or its ruin?
我们目前只称呼一个星球为家园。我们是否是它被改善或被毁灭的原因？
We currently call only one planet home. Will we be the cause of its improvement or its ruin?
我们目前只称呼一个星球为家园。我们是否是它被改善或被毁灭的原因？
