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

The knowledge of the circumstances of which we must make use never exists in concentrated or integrated form, but solely as the dispersed bits of incomplete and frequently contradictory knowledge which all the separate individuals possess.

世上任何卓越的成就都缺不了熱情。

成功不是給予的，而是贏得的。

Quality is never an accident; it is always the result of intelligent effort.

質量不是一種工具，而是一種心態。