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.
…と思っていた　そこで我々の最初の調査は 地殻形成の現場を探査する事に集中し 6万7000キロ余りの全長にわたって火山活動の特徴を調査しました