Struggling with an evaporation of advertising and a downward drift in street corner sales, The New York Times intends to introduce a "metered" model at the beginning of 2011.

为了应对广告的减少和街角销售的下滑，《纽约时报》打算在2011年初引进一种“计量”模型。

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Positive ions drift downward, negative ions drift upward.

正离子向下漂移，负离子向上漂移。

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The indoor experiment on the filling materials used for downward slicing drift mining with cemented backfill in Gaolong Gold Mine was performed.

对高龙金矿下向分层进路胶结充填采矿法所用的充填材料进行了室内试验研究。

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It is also likely that the downward drift in the markets is having an impact, though some of the shift simply reflects a reversion back toward the historical averages registered by the survey.

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It hopes to bring the inflation rate to 2% and put to an end to a downward drift in consumer prices that has persisted for 14 years, undermining business and consumer confidence in the world's third largest economy.

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You can see from the plot that the pattern is a sudden jump and then a slow drift downward.

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