食用番茄是有好处的，因为它们所含的番茄红素是一种抗氧化剂，因此从内部起着防晒霜的作用。
It is good to consume tomatoes as they have lycopene, which is an antioxidant and hence works as a sunscreen from within.
上次我们讨论了光合作用，即植物利用光将二氧化碳和水转化为食物的过程。
Last time we talked about photosynthesis, the process by which plants use light to convert carbon dioxide and water into food.
一个越来越有吸引力的理论认为，大气中二氧化碳的减少引发降温趋势，这趋势导致冰川作用。
An increasingly attractive theory holds that decreases in atmospheric carbon dioxide start the cooling trend that leads to glaciation.
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