a trial that cannot be completed or whose result has no legal value, usually because a legal mistake has been made(通常由于诉讼程序方面的错误而造成的)无效审判
The judge declared a mistrial after newspapers printed a juror's name.在一家报纸刊登了一名陪审团成员的名字之后,法官宣布审判无效。
He went on trial for the second time after the first case ended in a mistrial.在第一次审判结果被认定无效后,他又一次接受了审判。