（首先）First（其次）Second（再次）Third
书面式表达：
First of all，secondly ，thirdly
and then，next，finally
例句：
There exists profound social background behind German social securitylegal system, including cultural tradition, workers movement and economicsystem-social market economy.
德国社会保障法律制度的建立和发展有着其深刻的社会历史背景，首先是文化传统，其次是工人运动，再次是经济体制&社会市场经济。
The second one analyzes the reference of Novalis, which is divided intothree sections: first is poetry philosophy, secondly is the construction of theimage system and literature theory.
第二章主要是冯至对诺瓦利斯的借鉴，分为三节：首先是在诗性哲学方面，其次是意象体系的建构，再次是文艺思想。
First of all,secondly ，what's more可以么？三个例子是各自独立的。
追答可以的呀
其实没有严格的非说哪一个，表明清楚层次就行了
本回答被提问者采纳首先
in the first place;
in the first instance;
first of all; first off;
(the) first thing;
above all;
for one thing;
for a start;
to start with;
to begin with