As snowy Davos becomes engulfed in the hustle and bustle of another World Economic Forum, Microsoft founder Bill Gates took the opportunity to deliver an upbeat message in his annual newsletter. 随着新一届世界经济论坛即将开始,...
氧气是所有动植物生命的基础。它是我们最重要的营养物质,每时每刻每个细胞都需要氧气。没有氧气,我们就无法从食物中释放出能量,并驱动身体的所有反应。但氧气的化学特性很...