一只蝴蝶在我身上停留了三十分钟。

A butterfly stayed on me for thirty minutes.

youdao

游了三十分钟后，青蛙觉得水变暖和了，但他觉得这是一个惊喜。

After thirty minutes of swimming, Froggie felt the water was warmer but he regarded this as a nice surprise.

youdao

三十分钟后我们会看到瀑布。

After about 30 minutes we will see a waterfall.

youdao

How many people know that three times a week physical exercise,30 minutes each time has the same effect ? as our most powerful psychiatric drugs?

多少人知道，每周三次,体育锻炼，每次三十分钟，与最强劲的精神药物,有同样的效果？

哈佛公开课 - 幸福课课程节选

If you measured, if somebody measured levels of insulin in your blood after lunch, if they took it 10 minutes, 30 minutes, an hour, you would see that it's going slowly up.

如果这时候检测,如果有人测量午饭后十分钟,三十分钟,及一个小时血液中的胰岛素水平,就会发现它在缓慢地升高

耶鲁公开课 - 生物医学工程探索课程节选