Sailors long ago were often afraid that if they sailed too far from home they would fall off the __of the flat ocean.

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Sailors long ago were often afraid that if they sailed too far from home they would fall off the __of the flat ocean.

Sailors long ago were often afraid that if they sailed too far from home they would fall off the __of the flat ocean.
Sailors long ago were often afraid that if they sailed too far from home they would fall off the __
of the flat ocean.

Sailors long ago were often afraid that if they sailed too far from home they would fall off the __of the flat ocean.
Sailors long ago were often afraid that if they sailed too far from home they would fall off the earth.严格的说这其实是个地理题:中世纪人们人为地球是一个盘子,扁平状,航行到边上就会掉下去——所以后来哥伦布环行地球一周引起了轰动