最好的买入股票的时机是当它便宜的时候，最好的卖出时机是当它昂贵的时候。

In computer science, we often have to deal with systems that are too complex to understand all at once.

我总是努力保持谦逊并不断进步。

The environment is a long-term issue that requires long-term commitment.

我认为最好的表演来自于真实的地方。