选each
every 强调全体的概念,each强调个体概念.
看例子：
Every student in our school works hard.
我们学校的学生都很用功.
Each student may have one book.
每个学生都可有一本书.
这里的team指的是6 teams中的个体,所以用each
There are 6 teams and each has 12 players.
翻译：
有6支球队,每支球队有12位球员.