The backward learning curve is evident when students initially struggle with a new concept before gradually improving.
当学生在初步接触新概念时遇到困难，然后逐渐进步时，可以观察到逆向学习曲线。
In the context of skill acquisition, a backward learning curve indicates a period of initial decline before improvement.
在技能习得背景下，逆向学习曲线表示在改进之前有一个初始的下降期。