吉尔布雷思夫妇设计了一个分类体系，标记了17种基本手势，他们将其称为动作分类体系。
Frank and Lillian Gilbreth devised a classification scheme to label 17 basic hand motions which they called therbligs.
现在谈论改变分类体系是不现实的。
To talk of changing classification systems at this time is unrealistic.
接受了美国和加拿大的经济分类体系，将经济分为750个不同领域，而不是之前的362个。
It adopts the economic classification system Shared by the United States and Canada, breaking the economy down into 750 different activities, rather than 362 as before.
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