他的脸上出现了一种奇怪的表情，然后他开始刨土。
An odd expression came into his face and he began to scratch at the earth.
她离开房间大约十分钟，然后带着困惑的表情回来了。
She was out of the room for about ten minutes and then she came back with a puzzled expression.
实验中，一位母亲被要求以正常的方式与她的孩子互动，然后面无表情，不给他们任何视觉上的社交反馈。
In it, a mother is asked to interact with her child in a normal way before putting on a blank expression and not giving them any visual social feedback.
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