问题描述：
句子里面的“clay”是什么意思?
“Certain men were very clever at measuring the time of clay according to the beating of their own hearts.”这里面的“clay”是什么意思?
“Certain men were very clever at measuring the time of clay according to the beating of their own hearts.”这里面的“clay”是什么意思?
问题解答：
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