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 first step is to establish that something is possible; then probability will occur.

我想像鳥兒歌唱一樣作畫。

The most exciting phrase to hear in science, the one that heralds new discoveries, is not 'Eureka!' but 'That's funny...'

Women belong in all areas of science, and their contributions are invaluable.

Twenty years of romance make a woman look like a ruin; but twenty years of marriages make her look like a public building.