城市是一个共享的房子,我们都是它的建筑师。
免疫系统就像一把双刃剑;它可以对抗癌症,但也需要被控制。
如果人类不能在我有生之年登陆火星,我将会非常失望。
Your self-worth is determined by you. You don't have to depend on someone telling you who you are.