In the rich world, though, the city is undergoing very different changes.
发达国家的城市却正在经历着完全不同的转变。
Since the 1930's, jeans have been through many different changes in style.
自从1930年代起，牛仔服在款式上已经历了多次不同的变化。
However, under different light and different angles, colors have different changes.
但在不同的光照下和不同的角度观察，颜色会有不同的变化。
However, under different light and different angles, colors have different changes.
但在不同的光照下和不同的角度观察，颜色会有不同的变化。
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