我在罗马逗留期间只见过她一次。

I only saw her once during my stay in Rome.

我们存了足够的钱，能一次付清款项买下这所房子。

We had saved enough money to buy the house outright.

我被困在最严重的一次大塞车之中。

I got stuck in the mother of all traffic jams.

提前发出的洪水水位上涨警报防止了又一次的重大灾害。

Early warnings of rising water levels prevented another major catastrophe.

这个协定是在联合国的一次会议上签订的。

The agreement was signed during a meeting at the UN.

这一次的研究太零散，难以发挥重大的作用。

The research is too unfocused to have any significant impact.

所有候选者都要参加一次小测验。

All candidates will be required to take a short test.

他提醒她道：“你出过一次事故了。”

‘ You had an accident, ’ he reminded her.

前几天我与她作了一次长谈。

I had a long conversation with her the other day.

一次考试不及格并非世界末日。

Failing one exam is not the end of the world.

他在一次事故中失去了双腿的功能。

He lost the use of his legs in an accident.