I just never keep it inside. Yeah, it's really hard for me to bite my lip.

我不能把话放在心里。对我来说，很难让我做到一言不发。

Well, 'cause I've been keeping it inside.

因为我把它深埋心底。

I don't say anything, I just keep it inside and walk away.

- 我什么也没说，我只是把它藏在里面然后走开。

The layers of the bubble surround the air inside the bubble, and keep it inside.

气泡的层层包围气泡内部的空气，并将其保持在内部。

Many of the vets who came back to their home, to their country didn't talk about it openly. They kept it inside them.

很多老兵回到家，回到家乡后，不会公开谈论它，他们把经历藏在心里。