“19世纪人类只有自然化肥可以使用，例如动物粪便，”Litaker说，也就是鸟类、鼠类和海豹的排泄物。
"In the 1800s people had to use natural fertilizers such as guano, " which is the excrement of birds, bats, and seals, Litaker said.
不明身份人士2：例如，靠动物排泄物过活的生活在旷野间的鸟类，这些排泄物中就含有E。大肠杆菌0157。
Unidentified Man II: You could have, for example, field birds feeding on animal fecal material that has E. Coli 0157.
不明身份人士2：例如，靠动物排泄物过活的生活在旷野间的鸟类，这些排泄物中就含有E。大肠杆菌0157。
Unidentified Man II: You could have, for example, field birds feeding on animal fecal material that has E. Coli 0157.
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