... secondary 第二的，副的，二次的，二次绕组 secondary actions 二次操作，二级操作 secondary air 二次风，二次空气 ...
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A primary action is typically supported by secondary actions.
一个主要的行动是典型的支持二次行动。
Facial expressions can often be used as secondary actions to body movement.
面部表情往往可以被用来作为二次行动，以身体运动。
Not clearly distinguishing between primary and secondary actions can easily lead to failure.
不明确区分主次操作会很容易出事。
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