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。
Positive ions drift downward, negative ions drift upward.
正离子向下漂移，负离子向上漂移。
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。
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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