Scientists have proposed a range of possible explanations, but the most likely one is that Earth’s early atmosphere included one or more ultra-insulating gases that kept its surface unseasonably toasty.

科学家们提出了一系列可能的解释，但最有可能的解释是， 地球早期的大气层包含一种或多种超绝缘气体， 使其表面异常温暖。