英德
有道
百度
谷歌
图片
维基
百科
极直径 [jí zhí jìng]
polar diameter
- 地球在两极扁平一点，所以其极直径略小于赤道直径。
The earth is slightly flat at the poles, so that the polar diameter is slightly less than the equatorial diameter. - 顶部扁平，颈部稍细，最细处直径约7米，状极突兀，形似一硕大蟒蛇破山而出，直欲腾空而去。
The towering crag looks rather perilous,exactly like a huge python breaking out of the mountain. - 1987年，一具连接著显微镜的摄影机，拍摄了极微小齿轮的相片，每个齿轮的直径和人的头发差不多。
In 1987 a camera attached to a microscope snapped images of tiny gears, each of which had a diameter approaching that of the proverbial human hair.
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中国词汇量第二的英语词典
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