own goal

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Germany’s own goal is more ambitious: a 40% reduction from 1990 by 2020.
德国自己的目标则更加远大：到2020年排放量要比1990年排放量减少40%。
Incapable of Roark's form of creative achievement, which he despises, Toohey has made his own goal power over the opinions of others.
由于没有能力与罗克创造性成就媲美，图希本人也鄙视这种成就，他用他人的看法来实现自己的目的。
Meanwhile, ConnectKentucky might beat Mr Bush to fulfilling his own goal.
同时，肯联可能领先布什达到他的目标。

He said the goal is to reach the point where the Afghan people can take care of their own security.
So input is an int called F, print out to the screen or your piece of paper the value of C. Odds are you only need two, maybe three lines of code for this, but the goal ultimately will be try it on your own.
所以输入是一个int类型的F，在你的屏幕上,或你们的纸上打印出C的数值,可能你们需要两行或者三行的代码,但是最终的目标需要你自己独自尝试。
哈佛公开课 - 计算机科学课程节选
So our main goal, at least my own passion is artificial intelligence.
我们的主要目标，至少我自己最热衷的，是人工智能。
什么是认知科学？ - SpeakingMax英语口语达人

But it's still far shy of its own goal of becoming banker to the third world.
FORBES: Magazine Article

In sports, if someone scores an own goal, they accidentally score a goal for the team they are playing against.
If a course of action that someone takes harms their own interests, you can refer to it as an own goal.