Bad air quality can contribute to many health problems such as asthma, and improperly discarded garbage can spread bacteria that are dangerous to health.

糟糕的空气质量会导致许多健康问题，比如哮喘，而丢弃不当的垃圾会传播细菌，危害健康。

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What is more significant than any geographical spread is the access that different levels of society had to good-quality products.

比地理上的广阔分布更重要的是，社会的不同阶层都能够获取这种高质量的产品。

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Word will spread quickly when a company's quality starts improving, especially if you thank specific customers for their assistance.

当一个公司的质量开始改进，口碑会传播得很快，尤其你感谢那些特别顾客对你的帮助。

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In the 1990s, ISO9000 (a quality management system) spread through many industries.

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"I am 100 percent convinced that if we are going to have comprehensive affordable quality coverage for all and spread the risk amongst the entire population, you have to have individual mandates, " he says.

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Last year's subprime-fueled gridlock in the credit markets even spread to high-quality debt, however, as investors realized that the re-packaging and re-distribution of risky loans could signify a ticking time bomb in all corners of credit.

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