Instead of singing like the birds, I silently smiled at my incessant good fortune.
The discovery of stars orbiting the supermassive black hole at the galactic center was a turning point in astrophysics.
出自北齐·颜之推《颜氏家训·勉学》。博士:指学识渊博的人。一个学识渊博的人打算去买一头驴,可是写了三页纸也没有见到一个“驴”字。这句话常用来讽刺文章文辞繁冗、不得要领、苍白空洞。