By grazing on these herbs, the sheep develop a stronger resistance to diseases.

通过采食这些中草药羊的抗病能力大为提高。

In theory, this gives the organism certain advantages – it may become hardier by developing a resistance to disease, or in the case of GM food, may be bigger and require fewer nutrients to develop.

从理论上讲，这给生物体带来了某些优势——它可能会通过对疾病产生抵抗力而变得更坚强， 或者就转基因食品而言，它可能会更大并且需要更少的营养来发育。