adj.即将坍塌的,摇摇欲坠的;
例句:
That old building could tumble down at any time.
那座古老的楼房随时可能倒塌.
We stopped before a tumble-down building.
我们停在一栋摇摇欲坠的建筑物前.
He took a tumble down the stairs.
他摔下了楼梯.