So, for example, when most of us look at a picture like this of somebody looking sad, we instantly have a slight, measurable physical response: increased heart rate, sweating of the skin.
比如说，当我们中的大多数看到 一张某人看上去很伤心的照片， 我们马上会有一个轻微的， 可以测量出来的肢体反应: 心跳加速，皮肤出汗。