Textbook publishers connect professors, instructors and students in ways that alternatives, such as open e-textbooks and open educational resources, simply do not.
2019年12月四级真题（第三套）阅读 Section C
英语六级真题
Professor sometimes implement policies designed to minimize students' use of digital devices, and some instructors even confiscate tablets and phones.
2018年12月六级真题（第二套）阅读
柯林斯高阶英汉双解学习词典释义
N-COUNT
教练;指导者;(美国英语亦指)教师，大学讲师
An instructor is someone who teaches a skill such as driving or skiing. In American English, instructor can also be used to refer to a schoolteacher or to a university teacher of low rank.