n.信；证书，许可证；字母，文字；字面意义vt.用字母标明；写字母于；加标题；vi.写印刷体字母； 变形： 复数：letters过去式：lettered过去分词：lettered现在分词：lettering第三人称单数：letters 双语释义：n.(名词)[C]信,函件 a written or printed message sent usually in an envelope[C]字母 one of the signs in writing or printing that represents