脊柱病症者报道出现身体，社交及工作能力受限之比例从97年的20.7%增至05年的24.7%。

The proportion of spine patients reporting physical, social and work limitations rose to 24.7% in 2005 from 20.7% in 1997.

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一年前通用汽车在美国销量与在华销量之比为3:1，现在这一比例已下降至1.25:1。

Whereas three GM vehicles were sold in the U.S. for every GM vehicle sold in China a year ago, that ratio has fallen to 1.25 vehicles sold in the U.S. for every sale in China.

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核心负债比例为核心负债与负债总额之比，不应低于60%。

The core debt ratio is the proportion between core debts and debts, and shall not be lower than 60%.

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And the functionality goes as the square of the difference in electronegativity.

这个公式的泛函性与电负性之差,的平方成比例。

麻省理工公开课 - 固态化学导论课程节选