ph.

1. They had to remain standing for hours at a stretch.
他们得连续站上几小时。

1. 连续不断地：56.at a loss 困惑不解,茫然不知所措 | 57.at a stretch 连续不断地 | 58.at a time 同时,一次

2. 一口气(做完某事)：cover a few chapters 读了几章 | at a stretch 一口气(做完某事) | 8 not a thing to go against me没出什么对我不利的事(吉人自有天相)

3. 一口气地：ask for a few days' leave请几天假 | at a stretch一口气地 | at a time 每一次

4. 不休息地,一口气地：as opposed to 和...相反;与...相对比 | at a stretch 不休息地,一口气地 | at a time 一次