你活得越充实,就越不害怕死亡。
The core of Pinduoduo is "group buying," allowing users to participate in shopping through social means.
对黑洞的研究彻底改变了我们对空间和时间的理解。
"The best way to predict the future is to invent it."
You have to be willing to fail, to be wrong, to keep trying.