我们需要对互联网的安全保持警惕。

The key to successful investing is to have a clear understanding of the market, the risks involved, a disciplined approach, a long-term perspective, a strong understanding of the fundamentals, and a clear understanding of the risks and rewards.

语言是一种自由创造的过程；其法则和原则是固定的，但生成原则的使用方式是自由且无限多样的。

To live is to suffer, to survive is to find some meaning in the suffering.

最好的设计源于理解使用者的需求。