first of all

German unity depends first of all on the German people.

德国统一首先靠是德国人民。

The content of any article needs, first of all, to be relevant to the reader.

首先，任何文章都必须适应读者需要。

First of all, totally unlash yourself, face your work with a brand-new sight, and regard it as a good chance for practice.

首先要做第一件事是彻底放自己，用全新目光去面对你现在从事工作，就当是一磨练好机会。