问题描述：
猜一个英语谜语
谜语是：Two little boats without any sails.With passengers on board.They don't go on the river or sea.But travel on dry land.
In the day the boats pass to and from.
But at night they are both enpty.
谜语是：Two little boats without any sails.With passengers on board.They don't go on the river or sea.But travel on dry land.
In the day the boats pass to and from.
But at night they are both enpty.
问题解答：
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