At the turn of the century battery-powered vehicles were a common sight on city streets, because they were quiet and did not emit any noxious fumes.
在上世纪之交，电池驱动的汽车成为城市里的街道一景，因为它们行驶安静而且不排放有毒烟气。
This aircraft is battery powered, very quiet and can stay in the air for 20 minutes per sortie.
该机由电池供电，非常安静，每次可滞空20分钟。
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