區別：
1、電子郵件中有附件這壹項，因此，在電郵中要使用attached表示附件的意思。信函或者其他需要投遞的事物也有附件，但在信函中要表示附件，則需要用enclosed壹詞。
2、在生活中，當需要表達“將某文件隨信寄出”時，可以用attach和enclose兩詞。
3、Attach原指『釘或夾在壹起』，用釘書機把文件和信函釘（夾）在壹起，就是attach；例
Details of my qualifications and experience are on the attached sheet。
4、應征信和履歷壹般分別寫在不同的紙張，嚴格來說，如把信函和附件釘或夾在壹起，該照前面例句，用attached壹詞，如果信函和附件只是放在壹起寄出，就該用enclosed。兩詞用法分明，主要是看信函和附件是否釘或夾在壹起。
attached
英 [?t?t?t] ? 美 [?t?t?t]?
adj：附加的，附屬的，依戀的，愛慕的。
v：貼上，系，附上( attach的過去式和過去分詞)。
例句：
1、She is very attached to her family and friends。她非常熱愛家人和朋友。
2、Ford was attached to the battalion's first line of transport。福特曾在該營的第壹運輸隊服役。
enclosed
英 [?n?kl?zd] ? 美 [?n?klo?zd]?
adj：封閉的，被附上的，（用墻等）圍住的，與外界隔絕的。
v：（用墻、籬笆等）把…圍起來( enclose的過去式和過去分詞 )，把…裝入信封，附入，（尤指墻、籬笆等 ）圍住。
例句：
1、He tore open the creamy envelope that had been enclosed in the letter。他撕開了隨信寄來的奶油色信封。
2、 Please show your friends this letter and the enclosed leaflet。請把這封信和內裝的小冊子給妳的朋友們看看。
擴展資料：
attached英英釋義
adj
1、associated in an exclusive sexual relationship
Synonym:committed ?
2、used of buildings joined by common sidewalls，a block of attached houses
3、fond and affectionate：she was very attached to her father
4、being joined in close association，affiliated clubs，all art schools whether independent or attached to universities
Synonym：affiliated ? connected
enclosed英英釋義
adj
1、closed in or surrounded or included within
an enclosed porch，an enclosed yard，the enclosed check is to cover shipping and handling
參考資料：
百度翻譯-attached