The speaker empathizes, agrees with, or understands on a deep and personal level a particular comment made by another; the speaker deeply relates to someone's sentiment.

说话者对他人所作的某一特定评论表示同情、同意或理解。表示说话人也能感受到听话人的情绪。

I feel you! You have to show them you're better than that and keep on going! Cheer up!

我很懂你的感受！你必须让他们知道你比他们强，然后继续前进！振作起来！

Emily: I really hate Mondays!

Mike: I feel you sis.

Emily: 我真的很讨厌星期一！

Mike: 我懂你，老妹儿。

You say 'I know the feeling' to show that you understand or feel sorry about a problem or difficult experience that someone is telling you about.

当你理解对方讲的内容，或者同情他时，就可以使用这个表达。

-It’s so embarrassing when you can’t remember someone’s name.

-I know the feeling.

-当你忘记别人名字的时候，特别尴尬。

-我知道那种感受。