unforced error

基本解释

Federer wound up with 66 unforced errors, 28 more than Djokovic.
费德勒有66次非受迫性失误，比德约科维奇多28次。
If the NHS fiasco is a delayed consequence of Cameron-as-chairman, there might be fewer unforced errors in future.
如果说NHS的闹剧是卡梅伦曾作为主席的推迟的后果，那么今后这些非强迫性的错误可能会变少。
And Clijsters' steady strokes allowed her to extend rallies as long as necessary while committing only 12 unforced errors.
克里斯特尔斯稳健的击球，使她不惧深陷泥沼，她所送出的非受迫性失误只有12个。

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