Even though it's Earth-like, and even though early in its history it may very well have harbored Earth-like life, it soon succumbed to runaway greenhouse -- that's an 800 degrees [Fahrenheit] surface -- because of rampant carbon dioxide.
即使它是类地星球，即使在其初期， 它或许也是类地星球上生命居住的美好港湾， 但不久它就败给了一发不可收拾的温室效应—— 800度的高温的表面—— 起因就是猖獗的二氧化碳。