火山活动 huǒshānhuódòng volcanic activity Origin Definitions Defs Strokes Stroke Words Sentences Sents 火山 huǒshān noun volcano a mountain or hill through which lava, rock fragments, hot vapor, and gas are being or have been erupted from the earth's crust活动 活動 huódòng noun activity activity; event; maneuver; campaign; action taken to achieve a goal