在火灾、爆炸指数计算和危险性评价过程中,物质系数(MF)是最基础的数值,也是表述由燃烧或化学反应引起的火灾、爆炸过程中潜在能量释放的尺度。
食物质量降低，品种减少，或者是膳食不合理和习惯性的不良饮食习惯等在报道中都被称为食物安全系数低。
Low food security is defined as reports of reduced quality, variety, or desirability of diet and indications of disrupted eating patterns.
这种黑物质不发光，但它远远重于银河系数以亿计的恒星，使银河系的总质量达到太阳的一至二万亿倍。
While it emits no light, this dark matter far outweighs the Milky Way's hundreds of billions of stars, giving the galaxy a total mass one to two trillion times that of the sun.
高产水稻株系的抽穗前物质生产量、抽穗后物质生产量、生物产量以及经济系数均较高且变异系数相对较小。
Biomass production in the entire growth period, dry matter accumulated before and after heading stage, economic coefficient in high-yield rice were higher and their deviations were relatively narrow.
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