Definition: who someone is Level: B2
这位侦探不得不隐藏她的身份以有效调查此案。
The detective had to hide her ___identity to investigate the case effectively.
为了保护她的安全，这位证人被赋予了新的身份。
The witness was given a new ___identity to ensure her safety.
他在机场因为身份误认被警察拦下了。
He was stopped by the police because of a ___identity mix-up at the airport.
