Three plus three makes six.

三加三等于六。

《新英汉大辞典》

If possible, choose from three items or three estimates.

如果可能，从三个项目或三种估算中选择。

youdao

Three and three is six.

三加三等于六。

《牛津词典》

A researcher says three hundred forty-three thousand AIDS deaths in South Africa in the last ten years could have been prevented.

VOA: special.2009.03.16

It is 1.7475. Conclusion: if I start to react sodium with chlorine, the result is a crystal, a three-dimensional array.

这是1。7475，结论就是：,如果我使钠和氯反应，结果将会是一个晶体，一个三维排列。

麻省理工公开课 - 固态化学导论课程节选

and then you also have the smaller, you know like, three or four-story homes which one family may occupy.

然后你也有那种小一些的，只有三四层楼的，一个家庭就可以占据的房子。

上东区的氛围 - SpeakingMax英语口语达人

The more reliable three-month on three-month comparison showed prices fell by 1.5% in October.

BBC: House prices fell 0.7% in October, says Nationwide

The three-bedroom, three-bathroom house consists of three upper floors, each with its own apartment-like layout.

WSJ: Inside Story: A Modern Farmhouse in Austria

Now, Ms. Savage, 42, has finally designed a set for herself: a 2, 228-square-foot, three-bedroom, three-bath 1920s-era home.

WSJ: A Gossip Girl's Main Stage