Theoretical value was the theoretical amount of the sulfuric acid reacting with alkali metal like lithium, sodium, potassium in ore.

理论值即硫酸与矿石中锂、钠、钾等碱金属反应生成相应的硫酸盐的理论用量。

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A quantitative value representing the subjective rating or opinion of users reacting to seeing or using a system, as opposed to performance measures like task completion time or number of errors.

它是一个定量值，表明了用户观看或使用一个系统的主观评价和意见，不必要象绩效测量那样以任务完成所需的时间和错误数为指标。

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It is unfortunate that the perception that age is a problem can undermine the value gained through having had more experience in reacting to crisis and change.

FORBES: Be Responsive To Improve Your Career