He kept step with them, walking backward, a furious sneer on his face.

他跟在他们后面， 向后走，脸上露出愤怒的冷笑。

If she had possessed a leash, her mother would have been fastened to it as a means of tugging her along to keep step with the rush of other shoppers.

如果她手里有皮带，想必一定会紧勒着她妈妈，以拉着她像其他顾客那样匆匆赶路。