each+名词=both+名词复数=either+名词单数 例句
问题描述：
each+名词=both+名词复数=either+名词单数 例句
答
There are many trees on each side of the street.(强调个体）There are many trees on both sides of the street.（强调全体）There are many trees on either side of the street.（有一边）不能等同吧...