We know from ice core research that the transition from these cold conditions to warm conditions wasn't smooth, as you might predict from the slow increase in solar radiation.
对冰芯的研究告诉我们， 从寒冷气候到温暖气候的转变 并不是非常平缓的， 你们可以通过太阳辐射的 缓慢增加中推测出来。