在受精后大约六七个星期时，男性和女性胚胎之间没有什么差别。

For about six or seven weeks after conception, there is no differentiation between male and female.

《柯林斯英汉双解大词典》

六七口人的家庭在菠萝园是常事儿。

Families of six or seven are the norm in Borough Park.

《柯林斯英汉双解大词典》

只有六七个人到场。

Only about half a dozen people turned up.

《牛津词典》

Now, remember, the formation of the ionic bonds was from group one and group two, and over here with group six and seven.

现在请记住，离子键的形成,从第一族和第二族元素，与六七主族的元素相互构成的。

麻省理工公开课 - 固态化学导论课程节选

We have got an extensive subway system and an extensive bus system that we have had for 60, 70 years.

我们有大规模的地铁系统和巴士系统，它们已经有差不多六七十年的历史了。

纽约的公共交通 - SpeakingMax英语口语达人

So let me first say a little bit about the story line, and some of the themes at the beginning of Exodus, the first six or seven chapters.

首先再让我大概介绍一下故事，以及在《出埃及记》开篇中的一些主题，开始的六七章。

耶鲁公开课 - 旧约导论课程节选