Tree and flowers are on _____ bank of the river.A.either B.both C.any D.every

Tree and flowers are on either bank of the river.A.either B.both C.any D.every两边都有花木,either 是任何一边,每一边.There are tall buildings on _every side of the playground.A.all B.either C.every D.n...either好像是“两者中的任一个”的意思，怎么能表达“两边都有花木”的意思呢？也可能是我的理解有误，请您为我讲解一下！O(∩_∩)O谢谢~~这个不必纠结。either 是“两个中的任一个”，没错。具体用法：1）有时是两个之中，你可以任选一个【比如：There are two ways to go to Beijing, either you can travel on airplane or by train.】；而有时，它的意识和each一样，是“两个都”【比如：There are two roads leading to my school, one with trees on one side of it only, while the other with trees on either side of the road】。你看，两条路通往学校，其中一条路，只有一侧有树，而另一条路，路两边都有树。甭管那边（任意一边）都有树。