So quickly I realized that we were too optimistic about the future of Internet in China.

很快我就意识到,对于中国互联网的未来看的太过乐观。

斯坦福公开课 - 百度CEO李彦宏演讲：全球最大搜索引擎的发展课程节选

I'm optimistic about the audio equipment and about our slide material and things such as that.

我对我们的音响设备,和我们的投影材料等都很有信心

耶鲁公开课 - 聆听音乐课程节选

I'm frankly not that optimistic about that part of it.

我对此并不抱很大希望。

普林斯顿公开课 - 国际座谈会课程节选