The child started to tumble down the stairs.

孩子开始从楼梯上跌倒下来。

The walls begin 2 tumble down.

我的防火墙开始崩溃。

The walls begin to tumble down.

我的防火墙开始崩溃。

They run, tumble down, flee, resist.

人们跑着，冲撞着，逃着，抵抗着。

We stopped before a tumble-down building.

我们停在一栋摇摇欲坠的建筑物前。

That old building could tumble down at any time.

那座古老的楼房随时可能倒塌.

They tumble down mountainsides; they meander through flat farmlands.

它们滚滚冲下山脊, 蜿蜒穿过平坦的农田.

Most any other jet would probably tumble down into the trees.

许多其它的飞机在做这个动作时可能会翻滚着掉到地面.

Red into grey and tumble down, late roses filled with early snow?

却由红变灰终于跌落下来的蜀葵，需要那盖满了初雪的凋零的玫瑰吗？

When the purebred was a pup, he used to trip over them and tumble down the stairs.

当这只纯种狗还是只小狗的时候，常常被绊倒，摔下楼梯。