learning efficiency的用法和样例：
例句
- The little boy is always absent-minded in class, not to say his study efficiency after class.
这个小男孩在课上总是心不在焉，更不要说他课后的学习效率了。 - The experiment shows that autonomous class teaching activities can not only develop the potential of learners' autonomy, but also improve their learning efficiency.
实验结果表明自主式课堂教学活动不仅能开发学习者学习自主性的潜能，还能提高他们的学习效率。
