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Have you ever looked up at the night sky and wondered why the stars twinkle? In fact, the stars themselves do not actually twinkle——the illusion is caused by the numerous layers of atmosphere between us and them.
你是否曾抬头仰望夜空，思索着星星为什么会一闪一闪呢?事实上，星星本身并不能闪烁，感觉到星星在闪烁其实是一种幻觉，而这种幻觉是由于我们和星星之间的多层大气所造成的。
With the advent of freezers and mechanical refrigeration, ice cream production soared, with 150 million gallons of ice cream being made in the U.S. in 1919. Today, one simply has to walk down to his or her local ice cream shop to enjoy ice cream. The only difficulty is which flavor to choose.
有了冰箱和冷藏技术之后，冰淇淋制造业也随之蓬勃发展，一九一九年美国制造了一亿五千万加仑的冰淇淋。今天，只要走几步路，你就可以在住处附近的冰淇淋店好好地享用一番了，唯一的困难是选择何种口味的冰淇淋。
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