backchannel support的用法和樣例：
例句
- Therefore English teachers should make efforts to motivate students to give more backchannel support.
因此，廣大英語教師應儘力激發學生的反饋支持，搞好教學。 - Many scholars and English teachers have been studying backchannel support for years, which has great value in improving English teaching.
摘要基於廣大學者和英語教師對反饋支持的研究，筆者認為反饋支持對英語教學有很大的促進作用。
