run的名词形式怎么写

running n、 运转；赛跑；流出；
例句：
We chose to do cross-country running、
我们选择进行越野赛跑。
Running on the spot is good exercise、
原地跑步是一种很好的锻炼。

He had been running uphill a long way、

他向上坡跑了很长的一段路。

She wheeled around and started running、

她突然转身就跑。

The children came running into the room、

孩子们跑着进屋来了。

The machines are kept running night and day、

这些机器夜以继日地运转着。

She was slightly out of breath from running、

她跑过后有点上气不接下气。