at a stretch例句

He would stay for hours at a stretch in the laboratory.
他在实验室里一蹲就是好几个小时.

Can you work ( for ) six hours at a stretch?
你能连续工作六小时吗 ?

Today I really swam to my heart's content . I did 3,000 metres at a stretch.
今天我一口气游了三千米,真过瘾.