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

What seems to us as bitter trials are often blessings in disguise.

History is that certainty produced at the point where the imperfections of memory meet the inadequacies of documentation.

理解量子力學不是接受它的奇異，而是將其視為現(xiàn)實的基本方面。