human
This Martian air is sure to give us trouble, the doctor said to me after considerable reflection.
gpt
In the first place, its red colour makes me fear it is not composed of the same gases that our air is. If it should turn out to be a mixture of oxygen and nitrogen, like ours, there is the possibility that this red matter which gives it colour will be poisonous to us. And even if it is not harmful, I do not think the air will have a pressure above ten or eleven, and we seem to need eighteen or twenty for comfort. I shall be very sorry if we have to return at once; but our supply of air is limited, you know.
human
You keep a close watch through your telescope for those flying men you promised to show me, I answered.
gpt
If they can live in this air, I think we can manage it somehow. I will not go back while there is a breath left in me.