In exchange, he guarantees an above-market price for each animal and a calf-to-customer electronic ear tag ID system like that used in the European Union.
2019年12月六級真題（第三套）閱讀 Section B
柯林斯高階英漢雙解學(xué)習(xí)詞典釋義
N-VAR
身份證明;身份證件
If you have ID or an ID, you are carrying a document such as an identity card or driver's licence which proves that you are a particular person.