unforced error

基本解释

Federer wound up with 66 unforced errors, 28 more than Djokovic.
費德勒有66次非受迫性失誤，比德約科維奇多28次。
If the NHS fiasco is a delayed consequence of Cameron-as-chairman, there might be fewer unforced errors in future.
如果說NHS的閙劇是卡梅倫曾作爲主蓆的推遲的後果，那麽今後這些非強迫性的錯誤可能會變少。
And Clijsters' steady strokes allowed her to extend rallies as long as necessary while committing only 12 unforced errors.
尅裡斯特爾斯穩健的擊球，使她不懼深陷泥沼，她所送出的非受迫性失誤衹有12個。

Jankovic won with steady play from the baseline, while the big-swinging Muguruza committed 29 unforced errors.
NPR: Ex-No. 1 Jankovic Advances At Rainy French Open
He improved to 55-1 at Roland Garros despite committing 40 unforced errors and facing 11 break points.
NPR: Djokovic's Day At The French Open Ends In Despair
But the Italian let himself down just as much with some sloppy shots, making 59 unforced errors.
NPR: Djokovic's Day At The French Open Ends In Despair