Question

On every side of the lake, there are wild flowers. 还是 On either side of the lake, there are wild

Answer 1

On both sides of the lake, there are wild flowers.
两边都有花

On either side of the lake, there are wild flowers.
只有一边有花

both，（两者）都
either，常与or连用，表示“不是……镇羡猜御型就是……”的意思，也就派带是说只有一方的意思

所以这题应该用either
every 一般是三者以上，every的用法 个体代词every只有形容词性质,在句中做定语。常用于修饰单词可数名词,述说对象至少为三 个。

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Answer 2

正确：On each /either side of...或者：On both sides of....