speak highly of...      大力讚揚....

=highly praise...

例:

The teachers speak highly of John.

A few days ago that newspaper ran an editorial which spoke highly of those who took the issue of global warming seriously.

highly 通常用來修飾表[讚揚]或[推薦]等動詞.

highly praise...             極力讚揚

highly recommend....    極力推薦

例:

They highly recommended him for the job.