sa·cred cow
noun/ˌseɪkrɪd ˈkaʊ/
/ˌseɪkrɪd ˈkaʊ/
(disapproving)- a custom, system, etc. that has existed for a long time and that many people think should not be questioned or criticized
不容置疑的习俗；批评不得的制度 - the sacred cow of free market economics
自由市场经济不容置疑的信念
- the sacred cow of free market economics