We think highly of this brand for its consistent quality.

think 是动词，意思是"认为、思考"。 highly 是副词，意思是"高度地、非常"，用来修饰动词或形容词。 of 是介词，表示"关于、属于"的关系。 think highly of 是一个固定短语，意思是"高度评价、推崇"，表示对某人或某物有很高的评价。