Instead they may have been the forebears of heat-loving bacteria that color the steamy geyser pools in Yellowstone National Park and populate submarine volcanoes.

• 他也勉强承认，那声名远播的化石可能不是行光合作用的生物，而是嗜热细菌的前身；这些细菌使得黄石国家公园热气蒸腾的间歇泉水池及海底火山显得色彩缤纷。