adj.协定的；商议好的；一致的
动词concert的过去式和过去分词.
As if this had been a concerted signal, the back door was struck rudely. 仿佛是在按照一个事先约定好的信号行事,后门顿时被不客气地捶了起来。
There has been a concerted campaign against the proposals. 人们将采取一致行动反对这些提议。
