in a summer camp和at a summer camp哪个是对的

in a summer camp是对的，例如：

1、Because my son joined in a summer camp last year， so I specially buy a sport stick for him.去年儿子参加夏令营，所以特地给他买了一支防晒棒。

2、but that is what I learned in a summer camp converted into a training program called Leadershape.但那是我从一个由夏令营转化而来的名为“塑造领袖”的培训项目中学到的。

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