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

悲觀的人雖生猶死，樂觀的人永生不老。

Collaboration is key—governments, businesses, and communities must work together for sustainable forests.

The best way to avoid mistakes is to gain experience.

A melody can stay with you forever.

Globalization is not an option but a necessity; Chinese companies must go global.

創(chuàng)新不僅僅是創(chuàng)造新事物，更是改進(jìn)已有的事物。

化學(xué)是在分子水平上操縱物質(zhì)的藝術(shù)，而催化是其最強大的畫筆。