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Scientists had volunteers place one hand, palm down, under a board.
科学家们让志愿者伸出一只手, 手心向下, 放在一块板下.
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Place your right hand, palm down, on the middle of your right thigh.
右手心朝下置于右大腿中间.
Then he ran his puffy palm down the length of his face and broke out laughing.
然后他用肥大的手顺着脸摸了一下,就突然开始大笑.
手心向下???掌心向下???
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