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

"In observational studies, we often have to rely on assumptions that are not directly testable."

How wonderful that we have met with a paradox. Now we have some hope of making progress.

"The past whispers to us through the pages of a biography."

You can't just give up on something because it's hard.

世界不是一個需要解決的問題；它是我們所屬的一個生命體。

The artist must be a researcher, constantly experimenting and exploring new possibilities.