The research results show that this method can simulate the practical condition well and it also indicates a way to improve emissions level and performance of automobile diesel engine.

结果表明，该方法能较好地拟合实际情况，为改善发动机的排放和性能指明了方向。

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So that's an equivalent of a return to 1990 level of emissions.

这相当于是回到1990年的排放水平。

对全球变暖的政策 - SpeakingMax英语口语达人

Only now will we have the socially optimal level of emissions, the level which provides the greatest amount of human happiness possible.

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In London, Picarro will place analyzers on the ground around the city as well as one on a bus to measure carbon emissions at road level and another on a plane to gauge emissions at higher altitudes.

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For instance, eight Northeastern states are developing an initiative setting state-level emissions caps and establishing a trading program.

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