问题描述：
猜一猜下面三个英语谜语分别指的是什么?
1.Have you heard the saying:what goes up must come down?Well what goes up and never goes down?
2.What has a face but no head?
3.What has legs but cannot walk?
1.Have you heard the saying:what goes up must come down?Well what goes up and never goes down?
2.What has a face but no head?
3.What has legs but cannot walk?
问题解答：
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