They were still gassing when I left.

我离开时，他们仍在吹牛。

Well, I can't sit here gassing all day.

好了，我不能整天坐在这里闲聊。

The girls were still gassing when I left.

我走的时候，那些女孩子们还在胡扯。

They were still gassing (away) when I left.

当我离开时，他们仍在乱吹。

Vents should be cut where the 'gassing' occurs.

排气口要开在发生“排气不良”的地方。