travelled distance
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该研究历时一年，所使用的对比卡车配有相同的发动机，研究启动时已行驶里程接近，且研究期限内的行驶里程也基本相同。
Trucks used for comparisons in the yearlong study had the same engines, similar miles already on them at the start and drove nearly the same number of miles over the year.
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