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

Science knows no country, because knowledge belongs to humanity, and is the torch which illuminates the world.

Every book is a journey, and every journey changes you a little.

"There is nothing more deceptive than an obvious fact."

The only thing that really matters in architecture is the quality of the space.

智者從敵人那里學到的比愚者從朋友那里學到的還要多。

要真正偉大，必須與人民站在一起，而不是凌駕于他們之上。