Amphicoelian
a. [動(dòng)](魚(yú)的脊椎骨等)兩凹的
??? 情景例句
Good Gemma.
乖Gemma。
Who has never tasted bitter, knows not what is sweet.
不嘗黃連苦，怎知蜂蜜甜。
They are often more industrious, useful citizens than those who are never late.
他們與那些從不遲到的人相比，常常是更勤奮有用的公民。