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。
But many siphons are needed for each lake, so the cost of de-gassing is high.
但是每个湖泊需要很多的虹吸管，因此提取这些气体的费用很高。
But many siphons are needed for each lake, so the cost of de-gassing is high.
但是每个湖泊需要很多的虹吸管，因此提取这些气体的费用很高。
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