A deciding event or action is more important than the rest because the final result, decision, or choice is changed by it.

The environmental argument was a deciding factor. 环境论证是一个决定性因素。

The chairperson always has the deciding vote. 主席总是具有最终的决定权。

Glennon scored the deciding goal in the final minute of the match. 格伦农在比赛的最后一分钟攻入了具有决定性的一球。