对陨石球粒质地的研究证实，它们的冷却速度相当快，短则几分钟，长则数小时，因此形成陨石球粒的高温活动肯定是局部的。

Study of the textures of chondrules confirms that they cooled rather quickly, in times measured in minutes or hours, so the heating events that formed them must have been localized.

youdao

长达数小时紧张忙乱的活动就在前面，帐篷要支起来，摊位要搭起来。

Hours of feverish activity lay ahead. The tents had to be erected, the stalls set up.

《柯林斯英汉双解大词典》

一天的活动分作6个时段，每个时段一小时。

The day was split up into 6 one-hour sessions.

《牛津词典》