In THREE decades of selling cars in southern California, David Wilson has been through countless ups and downs.

戴维·威尔森在南加州做了三十年汽车销售生意，他经历过无数次市场起落。

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The art market over the recent three years has been low, we witnessed the ups and downs and you also experienced real hardship towards success.

艺术品市场低靡近三年，我们目睹了市场起伏跌宕，你们也亲历了成功的举步维艰。

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Ordinary texture mapping can simulate three-dimensional objects relatively smooth surface, it is difficult to show that the surface of ups and downs, uneven results.

普通的纹理映射只能模拟比较平滑的三维物体表面，难以显示表面高低起伏、凹凸不平的效果。

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That's a whole lot of agony, and it affects three times as many women as men, largely because the ups and downs of our hormones seem to make us more susceptible, according to Andrew Charles, M.

CNN: Stop that splitting headache

Marc Katz, 34, co-founder of online T-shirt printer CustomInk, who learned what it was like to live with the ups and downs of starting three different businesses, from father Steve Katz, 62.

FORBES: Like Father, Like Child: Is Entrepreneurial Success Inherited?

The year 2011 was one of the most volatile ever for stocks, with ups and downs nearly as severe as during the financial crisis of three years ago.

FORBES: 2011: A Scary Year For Stocks, And Not The Last