backchannel support的用法和样例：
例句
- Therefore English teachers should make efforts to motivate students to give more backchannel support.
因此，广大英语教师应尽力激发学生的反馈支持，搞好教学。 - Many scholars and English teachers have been studying backchannel support for years, which has great value in improving English teaching.
摘要基于广大学者和英语教师对反馈支持的研究，笔者认为反馈支持对英语教学有很大的促进作用。
