全村共三十户。

There are thirty households in the village.

《新英汉大辞典》

好，共三十美元。为什么您不按普通邮件寄这印刷品？那样要便宜的多。

All right. That comes to thirty dollars. Why don't you send it by surface mail? Sending it like this is much cheaper.

youdao

一共三十多封，都是我父亲写的，上面的地址都是美国各地的学院和大学。

There were more than thirty of them, all handwritten by my father, all addressed to colleges and universities all across America.

youdao