kètáng lǐ de zàishuō yíbiàn zhèlǐ gǎi yíxià tōngcháng shì zài bāng nǐ bǎ jùzi shuō wěn

课堂里的“再说一遍”“这里改一下”通常是在帮你把句子说稳。

Phrases like 'say it again' or 'change this part' in class are usually meant to help you speak more steadily.