Or so we thought. And so in our initial explorations, we were totally focused on exploring the boundary of creation, looking at the volcanic features running along that entire 42,000 miles.
我们大概就是这样想的。所以在我们最初的探险中， 我们把全部精力集中在勘测正在形成的边界上， 研究贯穿整个42,000英里的火山地貌。