色多多在线观看播放-色多多在线观看高清免费-色多多在线观看视频-色多多在线看-欧美aaaaa性bbbbb小妇-欧美aaaav免费大片

合乎倫理的科學(xué)不是一種限制，而是信任的基礎(chǔ)。

Don't wait until everything is just right. It will never be perfect. There will always be challenges, obstacles and less than perfect conditions. So what. Get started now. With each step you take, you will grow stronger and stronger, more and more skilled, more and more self-confident and more and more successful.

Natural gas will play a critical role in the energy mix as we move toward a lower-carbon future.

The most important skill to learn is how to learn.

我不僅想成為最好的，我想成為有史以來最好的。

The past is not a single narrative but a web of interconnected stories.