A concerted action is done by several people or groups working together.
Martin Parry, author of the report, says it's time for concerted action by world leaders.
这份报道的作者马丁•帕里称各国领导人是时候采取一致行动了。
If you make a concerted effort to do something, you try very hard to do it.
He made a concerted effort to win me away from my steady, sweet but boring boyfriend.
他作了极大的努力把我从我那踏实、温柔但有些乏味的男友手中抢走。