Now the subject matter that he's chosen for this poem, for this so-called first poem, couldn't possibly be more appropriate.

现在他选这首诗的主题很重要，这所谓第一首诗可能不太恰当。

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Very frequently, as is the case in Gadamer, this meaning is called "the subject matter": that is to say, what--in thinking about literature in terms of form and content, let's say--we'd call "content."

高达美，又把这一含义称为主题：,当我们研究文学的,形式和内容方面时，主题即内容“

耶鲁公开课 - 文学理论导论课程节选