这个理论就是：在地球和火星的大气层里有足够的温室气体，来帮助提升温度，从而弥补了早期的太阳提供的较低的热量。
The idea was that trapped greenhouse gases in the atmospheres of Earth and Mars might have caused temperatures to raise enough to compensate for the low heat the young Sun provided.
可能有人会认为，从理论上来讲，饮酒提供的过多热量会促使人肥胖，不过我们从这些人身上看到的却不是这么回事。
One might think that the excess calories associated with alcohol consumption could, in theory, contribute to obesity, but that's not what we saw in these individuals.
理论上讲，当相对价格变化时，人们应该调节食物的购买种类，以达到热量摄入的最大化。
In theory, people should adjust their purchases of food when relative prices change so that they maximise their calorific intake.
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