The subject may merit a brief explanatory note.

这题目也许要个简明的注释。

This explanatory note seems to be closer to what is ment by the author.

这样注解比较切近作者原意。

Exhaustive circuit tourist map explanatory note.

详尽的线路导游图文字说明。

An added descriptive comment or explanatory note.

一种附加的描述性的解释或说明性注解。

The official prefixed an explanatory note to the list of statistics .

那官员在统计表前加了一段说明文字。