如果我有任何评论，我会写在页边空白处。

If I have any comments to make, I'll write them in the ___margin.

她在左页仔细画了页边空白用于笔记。

She carefully drew a ___margin on the left page for her notes.

确保留出足够的页边空白用于编辑和修正。

Make sure to leave a sufficient ___margin for editing and corrections.