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letter:a written or printed message that is usually put in an envelope and sent by mail 信,信件
letter是作“信,信件”是可數名詞,通常與動詞post,mail,read,receive,send,,write搭配,也就是説
寫信write a letter
寄信post/mail/send a letter
收到信receive/get a letter
閲讀信read a letter
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