The accident happened at 3 p.m.

事故发生于下午3点钟。

《牛津词典》

3 into 24 is 8.

24除以3等于8。

《牛津词典》

Question 3 was very difficult.

第3题难极了。

《牛津词典》

He would go to bed after dinner. But he could hear the orchestra playing until 3 in the morning.

VOA: special.2009.01.31

And, I will have office hours today 30 starting at about 3:30 to 4:30 if you want to see me.

另外你今天如果想来见过的的话,我的办公时间是从3：30到4：

麻省理工公开课 - 固态化学导论课程节选

So oxygen gets 3 pairs, and each chlorine gets 3 pairs, so now we're up to 9 pairs.

那么氧都有三对，每个氯有三对，那么现在我们用了九对了。

麻省理工公开课 - 化学原理课程节选