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

Science knows no country, because knowledge belongs to humanity, and is the torch which illuminates the world.

Technological innovation in mining isn't about replacing people, but about making their jobs safer and more productive.

在數(shù)學(xué)中，你不理解事物。你只是習慣了它們。

Problem-solving often requires restructuring one's mental representation of the situation.

我們必須找到一種方式來慶祝我們的多樣性并辯論我們的分歧，而不分裂我們的社區(qū)。

海洋不屬于我們；我們屬于海洋。

Adaptability is the key to thriving in a changing world.