alibi
1.N-COUNT 可数名词不在犯罪现场的证明 If you have an alibi, you can prove that you were somewhere else when a crime was committed.
2.N-COUNT 可数名词借口；托词 You can say that someone has an alibi when they can prove that something was not their fault.
A role as senior diplomat would be a good alibi for his absence.
高级外交官的角色将是他缺席的上佳托词。
