The main methods for studying the atmospheric environment in street canyons include field observations, reduced-scale physical models and mathematical models.

城市街谷大气环境主要研究方法包括外场观测、实验室物理模拟和数值计算。

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Technology has reduced transaction costs, making sharing assets cheaper and easier than ever—and therefore possible on a much larger scale.

技术已经降低了交易成本，使得共享资产比以往更便宜、更容易——因此，在扩大共享资产的范围是可以实现的。

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But technology has reduced transaction costs, making sharing assets cheaper and easier than ever-and therefore possible on a much larger scale.

但是，技术已经降低了交易成本，使得共享资产比以往更便宜、更容易——因此，在更大的范围内共享资产是可能的。

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Colombia has done especially well: partly because it switched from ineffective crop-spraying to large-scale manual eradication, its coca-growing land has been reduced by 60% in the last decade.

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With a full-strength workforce operating at reduced hours, businesses have the ability to scale up quickly when their economic situation improves.

WHITEHOUSE: Reforming Unemployment Insurance to Protect Jobs and Incomes for American Workers | The White House

But in 2011, the NFL introduced a rookie wage cap that reduced the pay for top-10 picks by tying salaries to a sliding scale.

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