He told me I was flat-footed.

他告诉我说我是扁平足。

He was a nimble-footed boy of ten.

他是个步伐敏捷的十岁男孩。

The government could be caught flat-footed.

该政府可能会猝不及防。

My horse is small but wiry and sure-footed.

我的马虽矮小，但身体结实，步伐稳健。

They were caught flat-footed by the attack.

他们冷不防遭到了攻击。