也正是由于有了这种智力手段，才有可能对各种生产方法的效用进行量化的比较。
It is the mental device that provides the opportunity to compare degrees in the usefulness of various methods of production.
为了进一步了解酒精可能存在的效用，研究人员已经开展了一项对873名风湿性关节炎病人和1004名未患该病的人进行比较的研究。
To learn more about alcohol's possible effects, researchers have now done a study comparing 873 people with RA and 1, 004 people without the disease.
为了进一步了解酒精可能存在的效用，研究人员已经开展了一项对873名风湿性关节炎病人和1004名未患该病的人进行比较的研究。
To learn more about alcohol's possible effects, researchers have now done a study comparing 873 people with RA and 1,004 people without the disease.
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