Second of all, there's generally an account of the historical circumstances that are leading to the treaty: so some kind of historical prologue.

第二个，交代一下,签订契约的，大的历史环境,也就是，历史开场白。

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So economically it meant more-- it made more sense to eat meat under those circumstances, but of course the meat didn't exist in all places of the world, so some people were dependent on plants.

因此,从经济角度看,在那样的环境中,食肉更加合理,当然肉类并不是世界各地到处都有,因此,有些人们就依赖于农作物

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