corroboration
n[U]
confirmation or support by further evidence, esp from a different source; additional evidence 进一步的证实(尤指另有来源的); 进一步的证据
His possession of the gun is corroboration of his guilt. 他藏有枪是他犯罪的又一证据.
In corroboration of his story (ie to give support to it) he produced a signed statement from his employer. 为了进一步证明他所说的是事实, 他出示了一份雇主签了字的文件.