—— 请按键盘 空白键 开始游戏 ——

你能给别人的最大礼物就是你的时间,因为你给了他们永远无法收回的东西。
The greatest gift you can give someone is your time because you're giving them something you can never get back.
Natural experiments are a powerful tool for understanding causal relationships in the real world.
我不害怕去爱。
A great novel is one that changes the reader, that leaves him different after the last page.
在距离与重量成反比的情况下,物体处于平衡状态。