ALMOST nothing is known of the men who built the great medieval cathedrals. A mason's mark chiselled on a column; a game of nine-men’s-morris scratched on a stone; a gargoyle's half-human face, of foreman or master of works, are all that remind observers of the crowds of labouring souls who raised Canterbury or Winchester, Beauvais or Cologne.
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The researchers then tested the dogs' ability to distinguish between human facial expressions by showing them the other half of the person's face on images totally different from the ones used in training.
研究人员随后给狗狗展示与训练中完全不同的人的另一半脸，来测试它们区分人类面部表情的能力。
Showing dogs the opposite half of the face to the half they had learned to recognise in their training, showed they could "transfer their knowledge" of human facial expressions.
研究人员给狗狗们展示它们在训练中所辨认的半张面部图片的另一半，结果表明它们对人类面部表情的知识可以“活学活用”。
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