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

Success comes when you focus on the long-term, not just the quarterly results.

"History is not the past—it is the method we have evolved of organizing our ignorance of the past."

Every problem in mathematics is a puzzle waiting to be solved, and the joy is in the solving.

?智慧之光如太陽照耀著智力。