... ambulance fleet 救护车车队 ferry fleet 渡轮船队 existing fleet of vehicles 现有车辆总数 ...
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existing fleet of vehicles
现有车队
以上为机器翻译结果，长、整句建议使用 人工翻译 。
Even if 50 percent of new cars sold in the U.S. next year were electric, he points out, it will still take years to replace the existing fleet of vehicles on U.S. roads.
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