如果你每天平均吸20支烟，已有20年的吸烟史，那么你的吸烟指数就是400。
If you smoke 20 cigarettes a day, on average, more than 20 years of smoking history, then your smoking index was 400.
采用氧指数和烟密度分析方法，对无卤阻燃聚乙烯试样燃烧性能测试的影响因素进行了分析。
The factors of flammability testing of no-halogen flame-retardant PE were investigated by testing methods of the oxygen index and the smoke density.
研究结果表明，材料的氧指数、烟密度与炭化剂的用量成正比，而起始膨胀时间与炭化剂的用量成反比。以直接模压成型方法制得的材料膨胀性能较好。
It was found that its oxygen index, smoke density were directly proportional to content of carburizer whereas its initial expanding time was inversely proportional to content of carburizer.
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