principal of business house

例句：

1. 1. Theprincipal of the school is Mr. Smith.
   学校的校长是史密斯先生。
2. 2. Hewas the principal of theschool for many years.
   他在学校担任校长多年。
3. 3. The principal announced thenew policy to the students.
   校长向学生们宣布了新的政策。