with fingertips pointing down
指尖向下
以上为机器翻译结果，长、整句建议使用 人工翻译 。
Scientists had volunteers place one hand, palm down, under a board.And they asked the subjects to guess, by pointing to the board with their other hand, where their hidden knuckles and fingertips lay.
科学家让志愿者们把一只手放在一块板下，手心向下，然后让他们用另一只手隔着板指出板下那只手的指关节和指尖的位置。
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