他们认为她杀了她的丈夫，但他们没有确凿的证据。

They think she killed her husband, but they have no ___concrete evidence.

我们对想要什么有个大致想法，但眼下还没有具体的东西。

We've got a general idea of what we want, but nothing ___concrete at the moment.

另一个确凿的证据是，来自较贫穷背景的孩子更倾向于成为麻烦制造者。

Another piece of ___concrete evidence is that children from poorer backgrounds are more inclined to be troublemakers.