冬季当空气质量指数超过一百五十的那几天，我们禁止居民燃烧木材。
On the individual level ... on certain days in winter when the air-quality index is over 150, we prohibit residential wood-burning.
通过综合指数选择法，选出了优良速生、耐寒家系和单株，并率先选择了速生、耐寒且木材品质好的优良单株。
Ultimately some elite families and trees with rapid growth, good cold tolerance and good wood properties were selected by a comprehensive index method.
结果表明，经过阻燃处理的木材其氧指数和剩碳率比未处理的木材升高，而热降解反应活化能和分解温度降低。
Experimental data showed that for the treated wood there was an increase in char yield and LOI, and decreases in activation energy and temperature of decomposition.
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