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 the long history of humankind (and animal kind, too) those who learned to collaborate and improvise most effectively have prevailed.

作家的功能不是解決問題，而是正確地陳述問題。

Science thrives in an environment of openness and collaboration.