当哥伦布第一次提出地球是圆的假设时，很少有人相信它。

When Columbus first presented his hypothesis that the earth is round, very few believed it.

youdao

当哥伦布第一次提出地球是圆的假设时，很少有人相信它。

When Columbus first presented his hypothesis that the earth is round, very few believed it.

youdao