協力的英文：
to unite efforts; to join in a common effort; to work in concert; to join forces

efforts是什么意思：
n. 努力，尝试；成就；杰作

It was a vain effort.
这种努力是徒劳无益的。

That effort will be bootless.
那种努力将是无益的。

You must not relax your efforts.
你不可以松懈你的努力。

join是什么意思：
v. 连接，接合；会合，交汇；加入，参加
n. 连接，接合；连接处，接合点

join battle with
接战|交战|剧烈争辩|开始比赛

To join or be joined end to end;abut.
首尾相连在末端相连或毗连；邻接

The system tried to delete the JOIN of a drive that is not joined.
系统试图解除未合并驱动器的JOIN。