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.
后者是基于供给过程的反应物质量按化学计量系数算得的。
Based on a reactant fed to the process according to the stoichiometric coefficients.
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