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The amount of variation changes'by as much as 20 degrees as one circumnavigates the earth.變化量大致在繞地球一圈20度上下改變....

circumnavigates的音標(biāo)：...

n.環(huán)航( circumnavigate的名詞復(fù)數(shù) )v.環(huán)航( circumnavigate的第三人稱單數(shù) )...