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One acre of farmland use to for raising cows can produce 250 pounds of beef.
出自-2013年6月听力原文
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Another factor is the squeeze that conventional dairy farmers have felt as the price of grain they feed their cows has gone up, tightening their profit margins.
2019年12月六级真题（第三套）阅读 Section B
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They have painted half of the cows with eyes and left the other half as normal.
2018年12月六级真题（第一套）阅读 Section A
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In what's probably the craziest headline I've ever written, I've reported that advances in livestock protection are happening with scientists painting eyes on the butts of cows.
2018年12月六级真题（第一套）阅读 Section A
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The unpredictability of global demand and the lag-time it takes to add more cows to a herd to meet demand can result in events like the recent cheese surplus.
2019年12月六级真题（第三套）阅读 Section B