single af是什么意思

　　例句：

　　How much is the single fare to Glasgow?

　　去格拉斯哥的单程票多少钱？

　　When will the single currency be operable?

　　什么时候实行单一货币？

　　The band releases its new single next week.

　　这支乐队将于下周发行新的单曲唱片。

　　The bridge crosses the river in a single span.

　　河上的桥为单跨桥。