采用目前美国国家海洋局（NOAA）推荐的双边界二分式条件价值评估方法，对北京市空气质量改善产生的健康效益进行评估。
The double-bounded dichotomous discrete contingent valuation method recommended by US NOAA was applied to evaluate health gains from air quality improvement in Beijing.
我国于2 0 0 1年在银行间债券市场推出了“双边报价”制度，但其与真正的做市商制度仍有较大的差距。
In 2001, our country carried out the system of "bilateral quote" in bond markets among banks, but compared with the market maker the system still has a long way to go.
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