除此之外，放弃劳动密集型的粮食生产，解放了土地和劳动力，形成了更高效的农业部门。
Apart from this, being able to give up labor-intensive grain production freed both the land and the workforce for more productive agricultural divisions.
实现生物多样性和陆地食物供应目标的一种选择是用更少的土地生产更高的产量，从而腾出土地用于保护目的。
One option for moving toward both biodiversity and terrestrial food supply goals is to produce greater yields from less land, thereby freeing land for conservation purposes.
铁制锄头使土地更高产，铁制武器使战士更强大，它们在许多非洲西部的部落中都拥有象征性意义。
Iron hoes, which made the land more productive, and iron weapons, which made the warrior more powerful, had symbolic meaning in a number of West Africa societies.
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