two序数词为second，副词为secondly

例句

1.

Firstly, it's expensive, and secondly, it's too slow.

首先是价格贵，其次，速度太慢。

2.

You need, firstly, a strong independent board of directors and secondly, an experienced and dedicated staff.

你首先需要一个强大的独立董事会，其次需要一批富有经验并且爱岗敬业的员工。

two的序数词是:second"第二"，它的副词是secondly。