This is the 131st most frequent Korean word.
교수는
"교수는" means "professor is" or "professor (subject marker)" in English.
Here, '교수는' refers to the subject of the sentence, indicating that a professor is performing the act of teaching knowledge.
교수는 학생들에게 지식을 전수합니다.
The professor imparts knowledge to the students.
In this sentence, '교수는' again acts as the subject, focusing on the professor's action of preparing.
교수는 강의 준비를 하고 있습니다.
The professor is preparing for the lecture.
Here, '교수는' is used as the subject, emphasizing the significance of a professor in the university setting.