So hopefully, it was a time issue in terms of looking at the periodic table, because let's have you tell me what are we looking for here?

希望刚才大家出问题的原因,是因为看周期表有时间限制，请大家告诉我,我们在这里找什么？

麻省理工公开课 - 化学原理课程节选

between the hours, like, two and four, and eight and ten.

时间是有限制的，就是下午的两点到四点之间，晚上的八点到十点之间。

有趣的吃东西协会 - SpeakingMax英语口语达人