英语翻译这里“among”是怎么翻译?另外,介词短语做后置定语,of前面往往不是名词吗?这边怎么是形容词?

Swan is among the most beautiful of birds.天鹅是最美丽的鸟之一.
这里beautiful是形容词做名词用,表示最美丽的鸟
比如：He is among the smartest of the students.
可以改成是：Swan is among the most beautiful birds.天鹅是最美的鸟之一.
或者Swan is the most beautiful among birds.天鹅是鸟类中最美丽的.
among 后面跟复数名词,翻译成 ...之一