念音	〔R34〕  A pitcher with a thousand chinks.                  Yet never lets out the water it drinks. 〔译注〕 一个水罐带着千个裂罅，却从不放出它所喝的水。 〔提问〕 If it is a porous (多孔的) substance (物质), what is it? 〔谜底〕 s_____
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