By contrast, vehicles in rich countries have averaged perhaps 1.3 occupants (with the number falling over time) and were almost never used as a form of exchange.
相比之下，富裕国家的车辆平均只有1.3个乘客(而且随着时间的推延，还呈现下降的趋势)，而且几乎从未用作交换的手段。
By contrast, vehicles in rich countries have averaged perhaps 1.3 occupants (with the number falling over time) and were almost never used as a form of exchange.
相比之下，富裕国家的车辆平均只有1.3个乘客(而且随着时间的推延，还呈现下降的趋势)，而且几乎从未用作交换的手段。
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