But the new cleaner fuel has come on stream just as regulators are clamping down on emissions of smog-causing nitrous oxides and soot-like particulates, which have been linked to lung cancer.
不过这种更干净的燃料一直没能投入生产，直到决策者们决定限制一氧化碳和灰尘微粒的排放量（它们是有害烟雾的主要来源，煤尘微粒则与肺癌有联系）。
The construction project of damaged ecosystem in middle-down stream of Tarim river has been brought into Chinese national program of key river management.
我国特有的内陆河——塔里木河中下游受损生态系统建设工程已纳入国家重点大河大江治理项目之中。
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