有些炉子是烧油的，有些是烧瓦斯的。
不同于烧油的自动黄包车，周期人力车没有污染。但车夫的工作却不因此而变得轻松。
Unlike auto rickshaws, which burn fuel, cycle rickshaws produce no pollution. But the job of a rickshaw puller is not easy.
虽然我们的绝大多数电能都是有煤产生，但是如果没有那些烧油的卡车，那些煤该如何运出？
Sure, our electricity is generated mostly from coal, but how would the coal be extracted without those diesel-guzzling yellow trucks? How would it be hauled to the power plants?
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