These walls are really interesting. At first you hate it, then you get used to it. After a considerable period of time, you will depend on it.
人生是一场无法预测的冒险。
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。
We are survival machines – robot vehicles blindly programmed to preserve the selfish molecules known as genes.