请教一个句子的理解One only has to scratch the surface of life 【down o
请教一个句子的理解
One only has to scratch the surface of life 【down on the factory farm】 to see that Mad Cow Disease may well be only the tip of the iceberg.In a range of areas,from feeding regimes,to animal housing,to the use of drugs in the pursuit of productivity,human health may be threatened by factory farming.Imposing industrial demands on farm animals may,quite literally,be producing fatal flaws in the end product—our food.
我觉得 down on the factory farm 应该是个介词短语,作 life 的定语,可是查了多个字典都找不到确切的词义.请您指点一下应该怎么理解.