地球的赤道直径是7,929英里，两极之间的直径比赤道直径约少28英里。
The earth is 7,929 miles in diameter at the equator and about 28 miles less in diameter at the poles.
任何一本百科全书都会给你答案：赤道直径是12,756公里，或者，用英里来表达7,926英里。
Any encyclopedia will give you an answer: its equatorial diameter is 12,756km, or, for those who prefer to think that way, 7,926 miles.
阿特拉斯是两者中较平整的一个，极点间的直径只有18公里，但它的赤道周长却有40公里。
Atlas, the flatter of the two, has a diameter of only 18 kilometers from pole to pole but is almost 40 kilometers across its waist.
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