1·At the image top, over Io's limb, a bluish plume rises about 140 kilometers above the surface of a volcanic caldera known as Pillan Patera.
在这张照片的顶部，木卫一的表面上升起了一道大约140千米高的青烟，它从名为Pillan Patera的火山口喷发而出。
2·One is a volcanic mountain, with a turquoise lake in the caldera and forests on its flanks.
要么是一座火山，火山口上有滩碧绿色的湖，山的两侧是密密的森林。
3·The caldera is about 6.5 kilometers [4 miles] across. It formed following an eruption, when the emptied magma chamber collapsed under the weight of volcanic rock above it.
这座单体火山拥有几乎是世界上最大的完整火山喷口，这个直径约为6.5公里（4英里）的锅型火山口，是当熔岩从火山内腔流过时，上部的岩浆岩坍塌而形成的。