Many people fail to do this and wonder why they cannot concentrate.

很多人无法做到这一点，并且不明白自己为什么无法做到专注于学习。

youdao

Many people fail to do this and wonder why they cannot concentrate.

很多人无法做到这一点，并且不明白自己为什么无法做到专注于学习。

youdao