慢速英语:Was The Planet Mars Less Red Long Ago?
日期:2016-06-17
Words in This Story
ice age – n. a time in the distant past when a large part of the world or a planet was covered with ice
pole – n. either end of the imaginary line around which something such as the earth turns
ice cap – n. a very large and thick sheet of ice that covers the North Pole, the South Pole or another region
tilt – n. the state of having one side higher than the other
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