加工焦油砂能耗大，因此就得排放大量的温室气体。
Tar sands take lots of energy to process, and therefore entail copious emissions of greenhouse gases.
有时，是大楼住户首先注意到能耗大的特点。
Sometimes, a building’s inhabitants are the first to notice energy-wasting features.
有时，是大楼住户首先注意到能耗大的特点。
Sometimes, a building's inhabitants are the first to notice energy-wasting features.
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