全國英語等級考試二級閱讀文章段落精選（56）
Just like people, stars also have lifespan. A star keeps the same color and shape for most of its life. But when it gets very old, it swells into what is called a red giant. After reaching this stage, some stars begin to cool down and grow dim. Other stars explode into spectacular supernovas.
就像人類一樣，星星也有平均壽命。星星的一生大多數(shù)會維持相同的顏色與形狀，但是當時間一久，就會膨脹變成紅色的巨星，這時，有些星星的溫度會開始下降，光度也隨之下降。有些星星會爆炸，形成壯觀的超新星。
Just like people, stars also have lifespan. A star keeps the same color and shape for most of its life. But when it gets very old, it swells into what is called a red giant. After reaching this stage, some stars begin to cool down and grow dim. Other stars explode into spectacular supernovas.
就像人類一樣，星星也有平均壽命。星星的一生大多數(shù)會維持相同的顏色與形狀，但是當時間一久，就會膨脹變成紅色的巨星，這時，有些星星的溫度會開始下降，光度也隨之下降。有些星星會爆炸，形成壯觀的超新星。