Once we vacuum form the bubble, then we include another layer of material to seal the air inside the bubble.

一旦泡沫形成，就用另一种材料密封气泡内的空气。

He says, " you can feel the vacuum forming" .

他说，“你能感觉到真空的形成”。

You can feel the vacuum forming.

您可以感觉到真空形成。