美國超市的雞蛋都是清洗和消毒過的

Commercial American eggs are federally required to be washed and sanitized before they reach the consumer. 

https://www.forbes.com/sites/nadiaarumugam/2012/10/25/why-american-eggs-would-be-illegal-in-a-british-supermarket-and-vice-versa/#71eb18914050?