Some 450,000 of America's 1.3m livestock farms qualify as "confined feeding operations" (a poultry farm, for example, with more than 30,000 hens).

在美国一百三十万个家禽养殖场中，约有四十五万个符合“限制喂养作业”(例如，饲养三万多只鸡的养殖场)。

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Some 450, 000 of America's 1.3m livestock farms qualify as "confined feeding operations" (a poultry farm, for example, with more than 30, 000 hens).

在美国一百三十万个家禽养殖场中，约有四十五万个符合“限制喂养作业”(例如，饲养三万多只鸡的养殖场)。

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