深究

We should not delve too deeply into this painful matter.

我们不应该过深究件苦的事。

Formal style of writing, legalism, special jargonize, that's all hardly involved or studied in my language and literature learning.

正式的文体，法律用语，专业术语，些都是学习语文学的我不曾接触过或不曾深究过的。