The Changjiang River is one of the longest rivers in the world.river为什么要加“S”呢,
问题描述：
The Changjiang River is one of the longest rivers in the world.
river为什么要加“S”呢,
答
one of the rivers
众多河流之一
翻译过来就好懂了.
答
one of + the + * + 复数名词,表示“...其中之一”.
The Changjiang River is one of the longest rivers in the world.
翻译：长江是世界上最长的河流之一.