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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”是可数名词,通常与动词post,mail,read,receive,send,,write搭配,也就是说
写信write a letter
寄信post/mail/send a letter
收到信receive/get a letter
阅读信read a letter
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