1.
Columbus argues that the world is round.
哥伦布提出地球是圆的。
2.
Magellan's circumnavigation of the earth proved that it is a globe.
麦哲伦的周游世界说明地球是圆的。
3.
"Properly speaking, the earth is not round."
"正确地说,地球不是圆的。 "
4.
That the earth is round is certain.
地球是圆的是确实的
5.
The earth should be elliptical.
地球应当是椭圆形的。
6.
Planet Earth is an oblate solid.
地球是扁圆形的固体
7.
The earth is round, like an orange.
地球是圆的，就像个橘子。
8.
The moon does not describe a circle round the earth, but rather an ellipse
月球绕地球运行的轨道不是浑圆的，而是椭圆的。
9.
a sphere on which a map (especially of the earth) is represented.
上面画着地图（尤其是地球的）的圆球。
10.
The earth on which we live is a big ball .
我们居住的地球是一个大圆球。
11.
The earth is not a perfect sphere.
地球不是一个很圆的球体。
12.
it would look like a perfect ball.
你会发现地球是成正圆的球体，
13.
The earth is an oblate sphere.
地球是一扁圆球体.
14.
a projection of the globe onto a cone with its point over one of the earth's poles.
把地球的投影图做到一个圆锥上圆锥的顶点是地球的一极。
15.
Later on people have known gradually that the shape of the earth is a sphere.
后来人们逐步地了解到地球的形状是一个圆球。
16.
The Earth's path round the sun is elliptical.
地球绕太阳的轨道是椭圆形的。
17.
The path of the earth around the sun is oval.
地球围绕太阳公转的轨道是椭圆形的。
18.
Now we can reach the conclusion that the earth is round.
现在我们能证明地球是圆的这一结论。