1、
When a person is ill, the body's natural defence mechanisms come into operation.
当人生病时, 身体中的自然防卫系统就开始起作用了.
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2、
Improved Growth and natural Plant Defence Mechanisms interact and lead to overall plant health.
增强植物的生长和天然的防御机制和相互作用也提高植物的整体健康素质.
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3、
