赢得那个大客户是我们公司的首次。

Securing that major client ___was ___a ___first for our company.

在那个遥远的卫星上着陆巡视器对任何航天机构来说都是头一遭。

Landing a rover on that distant moon ___was ___a ___first for any space agency.

18岁出版小说在她的家族史上是前所未有的。

Publishing a novel at the age of 18 ___was ___a ___first in her family's history.