但当芦粟还没长大，或在老植株上长出新株的时候，芦粟作为放牧作物，对牛羊来说是危险的。
But as a grazing crop, sorgo is dangerous for cattle and sheep when the plants are young or when new growth has taken place on older plants.
自然资源得到了保护：肆意放牧、生计农业、薪材采集以及坡地作物种植致使黄土高原大片地区遭到毁坏。
Natural resources were protected: Uncontrolled grazing, subsistence farming, fuel wood gathering and cultivation of crops on slopes had left huge areas of the Plateau devastated.
如果放牧更加密集了，农作物可以扩展到空的牧场上种植。
If ranching were made more intensive, crops could expand into empty pasture.
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