one的序数词和频度副词是什么（one变成序数词怎么变）

one的序数词为first，频度副词是firstly

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.

Firstly, they must make certain that their pension needs are adequately catered for

首先，他们得确保他们能获得足够的养老金。

3.

The brochure is divided into two sections, dealing firstly with basic courses and secondly with advanced ones.

小册子分为两部分：第一部分涉及基础课程，第二部分涉及高级课程。