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

Give the pupils something to do, not something to learn; and the doing is of such a nature as to demand thinking; learning naturally results.

The development of algorithms is both an art and a science.

你的時間有限，所以不要浪費在過別人的生活上。

建筑的實質不是它的形象，而是它內部的空間。