医生在电话里说情况很严重，但不愿详谈。

The doctor said it was serious but wouldn't ___go ___into ___detail over the phone.

他的书不仅仅提到了问题，还详细阐述了可能的解决方案。

His book doesn't just mention the problem; it ___goes ___into ___detail about possible solutions.

你能详细说说在项目期间遇到的具体挑战吗？

Could you ___go ___into ___detail about the specific challenges you faced during the project?