20th的用法和樣例：
例句
用作形容詞 (adj.)
- There was very little evidence of economic gloom here at the 20th annual Supercomputing conference.
在今年舉行的第二十屆年會(huì )上，基本上看不出什么經(jīng)濟低迷的跡象。 - By the 20th day after mating, almost all the treated ewes had lost their embryos, but none of the controls had.
到第二十天時(shí)，幾乎所有經(jīng)過(guò)處理的羊都失掉了它們的胚胎，而那些有嗎啡寡聚核苷酸抑制的母羊則沒(méi)有。
