1. The volcanic eruption created a large expanse of pahoehoe lava flows.
火山爆发产生了广阔的带有波浪状的岩浆流。
2. The smooth surface of the cooled pahoehoe lava is fascinating to observe.
冷却后的带有波浪状的岩浆流表面光滑，观察起来令人着迷。