blue,beautiful,big,expensive,six hundred and ninetyseven hundred and twenty nine,百和十指间用” and” 连接。,200,400,三位数：,two hundred,four hundred,690-,729-,3,900-three thousand, nine hundred,two thousand, three hundred and ninety,四位数：,4,500- four thousand, five hundred,5，609-,2，390-,five thousand, six hundred and nine,Easy to do homework easy to find documents access a lot of information on the Internet,Expensive needs electricity to work can break down access to bad or incorrect information,Advantages:,Disadvantages:,
