Single.

常见例句

• The letter was written on a single sheet of paper.
  这封信只用一张纸写成。
• One single, second class, to winchester, please.
  买一张去温撤斯特单程二等票。
• He got over the stream with a single leap.
  他一跃就跳过了小溪。
• The bridge crosses the river in a single span.
  河上那座桥是单跨桥。
• Do you want a single or a return ticket?
  你要单程票还是往返票?
• Is the material single width or double width?
  这幅料子是单幅的还是双幅的？
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