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

"A writer's duty is to tell the truth, even when it is uncomfortable or inconvenient."

"RNA interference is a fascinating process that has opened up new avenues for understanding gene regulation and has potential therapeutic applications."

可持續(xù)發(fā)展不是一種選擇；它是我們對后代的責(zé)任。

我不害怕失敗。我不害怕冒險。

太陽是宇宙的靈魂，地球是它的軀體。

"La memoria es el único paraíso del que no podemos ser expulsados."

If you’re not willing to work hard, don’t expect success.

To understand the mind, follow its practical consequences.