writing paper的复数形式怎么写

writing paper and envelopes信纸和信封The writing paper is impressed with school seal.信笺上有学校的印记.Drouet selected writing paper while Carrie went to change her dress.杜洛埃找信纸写回信的当儿,嘉莉去换衣服....

writing paper的音标：writing paper的英式发音音标为：['raitiŋ 'peipə]writing paper的美式发音音标为：['raɪtɪŋ 'peɪpər]...

n.书写纸，信纸，信笺...