此外，撞击留下的大块物质会在主火山口周围形成二级火山口。

Also, large blocks thrown aside by the impact would form secondary craters surrounding the main crater.

youdao

幌筵岛的该地区由四个主火山口构成。

Four major volcanic centers create this part of the island.

youdao

夜里，埃塞俄比亚裂谷达纳基尔洼地，主火山喷口内活熔岩湖突破尔塔·阿雷火山部分破裂的硬壳闪闪发光。

Active lava lake inside the main caldera at night, glowing breaks through the thin and partially broken crust at Erta Ale volcano in the Danakil depression, Rift Valley, Ethiopia.

youdao