Definition
to bring something to completion
完善…
He added a few new items to round out the completeness of the report.
他添加了一些新項目來完善報告的完整性。
To round out the meaning, we need to add some final details.
為了完善意義，我們需要添加一些最終的細節。
The success of this exhibition doesn't solely rely on the paintings; we need some installations to round it out.
這次展覽的成功不僅僅依賴於畫作；我們需要一些裝置來完善它。