ever seen是见过的意思，而seen则是see见的过去分词，区别可以从以下例子看出：
Have you seen anything like it? I don't have ever seen anything like it in my 60 years live, it is an amazing. 你见过类似的吗？ 在我 60 年的生活中，我从未见过这样的事情，真是太棒了
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