He made ink from plant substances mixed with colored earth and soot.
他把种植物与彩色泥土和烟灰混合，制成了油墨。
After an investigation at the plant, the bureau found that the coal used as fuel was substandard, causing dusting equipment in the boiler to malfunction, sending out an excessive amount of soot.
环保局在热电站调查后发现该工厂使用煤做燃料是不符合标准的。从而导致了锅炉除尘设备的故障，以至于大量煤灰排到外面。
Catalytic converters on the cars and better filters on power-plant smoke-stacks have greatly reduced smog, smoke and soot in the air.
汽车的催化裂化器以及发电厂的过滤器降低了空气中的烟、雾、尘。
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