Reference ground, sometimes called a return path or signal common, is usually the reference potential of interest.

参考地，通常是指潜在的参考端，有时被称为回路或公用信号。

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It can catch someone's attention in a crowded room, "Eye contact and smile" can signal availability and confidence, a common-sense notion supported in studies by psychologist Monica Moore.

心理学家莫妮卡·摩尔的研究论证了一个常识：它可以在拥挤的房间里吸引别人的注意力，“眼神交流和保持微笑”可以展现你的亲切和自信。

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Another common way is using signal attribute.

另一种常见的方法是使用信号属性。

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The bank says that it will continue to recommend listings for firms in other sectors which, again, common sense suggests could be a signal for investors to sell.

ECONOMIST: Face value

Or you may be making a common body language error and reading too much into one nonverbal signal.

FORBES: How to Read Business Body Language Like a Pro - 3rd tip

The bills signal a historic change for Democrats in a state where owning a gun is as common as owning a car in some rural areas.

NPR: Colorado Governor Signs Landmark Gun Bills