Several years ago , Chinese streets were filled with people wearing identical drab clothing . Today , however , things are quite different and the streets are awash with people wearing fashionable bright colored outfits . Why has the change taken place ?

　　许多年前，中国大街上的人都穿一样的灰褐色衣服。然而，今天的情况大不一样了，街上满是一个个身穿色彩艳丽的时髦衣服的人。出现这种变化的原因是什么呢？