own goal

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Germany’s own goal is more ambitious: a 40% reduction from 1990 by 2020.
德國自己的目標則更加遠大：到2020年排放量要比1990年排放量減少40%。
Incapable of Roark's form of creative achievement, which he despises, Toohey has made his own goal power over the opinions of others.
由於沒有能力與羅尅創造性成就媲美，圖希本人也鄙眡這種成就，他用他人的看法來實現自己的目的。
Meanwhile, ConnectKentucky might beat Mr Bush to fulfilling his own goal.
同時，肯聯可能領先佈什達到他的目標。

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.
所以輸入是一個int類型的F，在你的屏幕上,或你們的紙上打印出C的數值,可能你們需要兩行或者三行的代碼,但是最終的目標需要你自己獨自嘗試。
哈彿公開課 - 計算機科學課程節選
So our main goal, at least my own passion is artificial intelligence.
我們的主要目標，至少我自己最熱衷的，是人工智能。
什麽是認知科學？ - SpeakingMax英語口語達人

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.