我们已开始拼车上下班。合乘汽车可为我们节省时间，减少车流量。
We have started car-pooling to work. By sharing a car, we are reducing our travel time and the amount of traffic on the road.
它们大大减少了路上的车流量。
不开车而是步行或者是使用自行车不仅帮助降低车流量同时也减少尾气排放。
Replacing ga car ride by walking or using the bicycle not only helps reduce traffic but also emissions.
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