出现这种变化的原因是什么呢的英文

why has the change taken place

• 出现:    appear; arise; eme ...
• 变化:    change; variety; t ...
• 的:    4次方是 The fourth po ...
• 原因:    cause; reason; acc ...
• 是:    Semantics
• 什么:    what
• 呢:    wool; woollen clot ...

例句与用法

1. Why has the change taken place
   出现这种变化的原因是什么呢？
2. 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？