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月六級(jí)真題（第三套）閱讀 Section B
If such an indicator exists, it is well hidden.
2016年6月六級(jí)真題（第三套）閱讀 Section B
柯林斯高階英漢雙解學(xué)習(xí)詞典釋義
Hidden is the past participle of hide .
ADJ
難以看見（或發(fā)現(xiàn)）的;隱藏的
Hidden facts, feelings, activities, or problems are not easy to notice or discover.