她在诗歌旁边写了详细的注释来帮助理解。

She added helpful ___annotations next to the poem to aid understanding.

教授在课堂上教我们如何在论文中添加注释。

The professor taught us how to add ___annotations to our essays in class.

这篇论文的电子版包含了作者添加的详细注释。

The digital version of this paper includes detailed ___annotations added by the author.