存在是be的过去分词；Done是do的过去分词。常用的是已经做了和已经做了，已经做了是主动现在完成，已经做了是被动现在完成。
In the past whilst working with AJAX-submitted forms, I have always created the forms in HTML and used the forms own POST function to submitting the actual data to a specific url. - This far is everyt
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