A hypothetical supercontinent that included all the landmasses of the earth before the Triassic Period. When continental drift began, Pangaea broke up into Laurasia and Gondwanaland.是什么意思_A hypothetical supercontinent that included all the landmasses of the earth before the Triassic Period. When continental drift began, Pangaea broke up into Laurasia and Gondwanaland.在线翻译_英语_读音_用法_例句