fumarole

noun

1. （火山区的）喷气孔
   an opening in or near a volcano through which hot gases escape

1. Hot spring and fumarole gas;
   热泉气、气泉气和冷泉气；
2. A fumarole is a vent, usually volcanic, from which gases and vapors are emitted; it is characteristic of a late stage of volcanic activity.
   翻译成中文为：喷气孔通常为火山喷气出口，从这个孔中火山气体和蒸汽喷射出来，为火山晚期阶段的特征。