地球的形状象个球体,大部分由岩石组成。
The Earth is shaped like a sphere and composed mostly of rock.
地球的形状像一个大球。
向正东走,你得考虑到地球的形状然后稍偏北行进。
That's because the Earth is curved. To travel directly east, you'd have to take into account the shape of the Earth and Angle yourself slightly north.
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