他因摔断了腿，只得靠一副丁字形拐杖支撑着行走。

He had to walk on crutches because he broke his leg.

这样一个丁字形的铁路网，结束了东北交通干线上马车、牛车的时代，成为东北交通大动脉。

The T-shaped railway network has ended the times of carriage and oxcart and been the artery of transportation in the northeast of China.