Cows, like humans, produce insulin-like growth factor in response to growth hormones and release it into the blood, and the protein makes its way into their milk.

奶牛和人一样，也能在生长激素的作用下分泌类胰岛素生长因子，这种蛋白质被释放到血液里，从而进入到牛奶中。

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Levels of iodine 131 entering the air can be very diluted, but if the iodine is deposited on grass eaten by cows, the cows will reconcentrate it in their milk by a factor of 1,000.

碘131进入空气后能被大量稀释，但是如果碘扩散到草地，草又被母牛吃掉，母牛会将碘的含量凝聚到1000倍。

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Levels of iodine 131 entering the air can be very diluted, but if the iodine is deposited on grass eaten by cows, the cows will reconcentrate it in their milk by a factor of 1, 000.

碘131进入空气后能被大量稀释，但是如果碘扩散到草地，草又被母牛吃掉，母牛会将碘的含量凝聚到1000倍。

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But another key factor is the demand for ethanol, according to Chris Galen, a spokesman for the National Milk Producers Federation.

NPR: Milk Costs Surge Due to Corn