结果表明，木材与CR ，PVC输送带相比点燃时间较长，热释放速率介于两者之间，CO生成率和比消光面积较小；
Test results show that wood has longer ignition time, less CO yields and less specific extinction area, but its heat release rate is between CR and PVC belts.
为了做出更准确的人口预测，人口统计学家必须比现在更多地了解生育率的社会和经济决定因素。
To develop more accurate population forecasts, demographers have to know a great deal more than now about the social and economic determinants of fertility.
阅读率是指经常阅读书籍、报纸和电子阅读材料的公民占所在地区的百分比。
Reading rate means the percentage of citizens regularly reading books, newspapers and digital reading materials.
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