It is natural to assume that as the Sun grows older, and uses up its hydrogen fuel-which it is now doing at the spanking rate of half a billion tons a second-it will become steadily colder and redder.

【参考答案】

很自然会想到，随着太阳的老化及氢燃料的日益耗用(目前它上面的氢燃料正在以每秒5亿吨的惊人速度燃烧着)，太阳将会不断地变冷......

(↓↓↓ 点击下方‘点击查看答案’看完整答案 ↓↓↓)