But another clue is the sort of smiles they give when they see each other when they walk into the lab.
但另一个线索是他们给出的微笑,当他们走向实验室时碰到对方。
Then when a stranger approaches or someone else approaches there they'll tend to give more of a greeting smile.
当陌生人或其他人接近时,他们是问候式微笑。
One group of children was a control group; the second group was taught to think back to experience that make them laugh or smile.
一群小孩组成对照组;,有人教第二组小孩回想,让他们大笑或微笑的经历。
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