A ratio change by as little as0.1 part per million could signal an influx of carbon dioxide from magma either building under or rising up through the volcano.是什么意思_A ratio change by as little as0.1 part per million could signal an influx of carbon dioxide from magma either building under or rising up through the volcano.在線(xiàn)翻譯_英語(yǔ)_讀音_用法_例句