该邮件以前被标记过其他动作，该动作标记已被取消。
This message was previously marked for a different action. The previous action has been canceled.
如果能观见腹部运动刹那刹那间快速变化，那么将难于对这样的运动作标记。
If it can be perceived to be changing very fast from one moment after another, then, it will be difficult to put labels on the movement.
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.
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