But Smith counters that if you factor in the hidden cost of government corn subsidies, environment degradation, and decreased human heath and animal welfare, grass-fed is the more cost-effective model.
2019年12月六级真题（第三套）阅读 Section B
柯林斯高阶英汉双解学习词典释义
N-COUNT
（野草或石南丛生的）荒野，荒原
A heath is an area of open land covered with rough grass or heather and with very few trees or bushes.