问题描述：
You can see railways,but there are no train on them; You can see roads,but there are no bick or ca
on them;You can see rivers,but there are no ships on them;You can see mountains,but there are no treeor fiowers on them,either.
what is it It`s a_____.
on them;You can see rivers,but there are no ships on them;You can see mountains,but there are no treeor fiowers on them,either.
what is it It`s a_____.
问题解答：
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