I went on a business tour to Chengdu five years ago,which left me a good impression.Our family specially visited Chengdu by air this year and found that Chengdu had become more tidy,the environment cl... I went on a business tour to Chengdu five years ago,which left me a good impression.Our family specially visited Chengdu by air this year and found that Chengdu had become more tidy,the environment cl...