比如说，他们在课堂上会感到困，无法完全集中注意力在学习上。

For example, they feel sleepy in classes and cannot concentrate attention on their study completely.

youdao

比如说，他们在课堂上会感到困，无法完全集中注意力在学习上。

For example, they feel sleepy in classes and cannot concentrate attention on their study completely.

youdao