Then a cautious advance of a few steps, setting his feet down softly like a hunting cat, and questioning the air as to the scent he had caught until all doubt vanished.

然后小心翼翼地向前迈出几步，像猎猫一样轻轻地放下脚，询问空气中他闻到的气味，直到所有的疑虑都消失了。