Hi Lotus, Yes, Natalia is correct: it means that the person has difficulty growing close to certain people. In this case, this person has difficulty building solid relationships with adults and peers. Here are a few more examples: "I could never be a teacher. I just cannot relate to children." "He turned her down when she wanted to be his girlfriend, saying he could not relate to girls with her personality." "The teen volunteering at the retirement home easily related to the elders, and now they love seeing him there every week." I hope these help. Please let me know if you have any more questions.

我们常讲理解万岁，理解很重要，我理解这个词的意思就是这个层面的意思。

I think you're right. If someone has a difficulty relating to other people, it means this person can't establish or maintain a relationship with them.