backward reference

例句：

1. 1. The company's decision to backtrack on its previous policy was met withsurprise.
   该公司决定撤回其先前的政策，这让人感到惊讶。
2. 2. The research paper citedseveral studies as evidence for its findings.
   该研究论文引用了若干项研究作为其发现的证据。
3. 3. The teacher used a backwardreference to help the students understand the conceptbetter.
   老师使用了一个反向引用来帮助学生更好地理解这个概念。