What a beautiful city it is！
  （这是个）多么美丽的城市啊！
句型：
（1）what + a/an +形容词+单数可数名词+陈述句（主语+谓语）　　　
       What a beautiful city it is!　　
　    What an interesting story she told! 　
（2）what+形容词+复数可数名词/不可数名词+陈述句（主语+谓语）　　
　    What expensive watches they are! 　　　
       What terrible weather it is!