We're dealing with probably the biggest missing link in what we know about human evolution.我们正在解决的可能是我们所知的人类进化过程中缺失最大的一环。Those documents provided the missing link, and the police were able to make an arrest soon after they discovered them.这些文件提供了必要的证据,警察发现之后很快就实施了逮捕。This bit of evidence proved to be the missing link in the murder case.要弄清这桩谋杀案独缺这点证据了。