study efficiency

• 学习效率

study efficiency的用法和样例：

例句

1. Study sessions that are too long are generally inefficient and counterproductive.
   通常的情况是，一次学习时间过长会使学习效率降低，并产生反作用。
2. 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。