He has some problems finishing this project now so he has to check his reference books.

要完成这个项目他现在有点困难，以至于他不得不翻阅他的参考书。

youdao

He has some problems finishing this project now so he has to check his reference books.

要完成这个项目他现在有点困难，以至于他不得不翻阅他的参考书。

youdao