In her conclusion, the author sounds a cautionary note.

作者在结尾时敲响了警钟。

《牛津词典》

So here's the obligatory, but important, cautionary note.

所以这里有些必需的，但重要的警示。

youdao

But I must end with a cautionary note.

但是我必须以一条警告来做结束语。

youdao

But I must end with a cautionary note.

但是我必须以一条警告来做结束语。

youdao