1N-COUNT 拇指纹 A thumbprint is a mark made by a person's thumb which shows the pattern of lines on its surface. 拇指纹
2N-COUNT 痕迹 If you say that something such as a project has someone's thumbprint on it, you mean that it has features that make it obvious that they have been involved with it. 痕迹
It's got your thumbprint all over it.
到处都有你参与其中的痕迹。
His personal goal was to put 'his thumb print' on a program of changes.