On the basis of referring a great deal of data, this article illuminate the deficiency of beeline depreciation break-point experience formula on double-declining balance method.

文章在参阅大量文献资料的基础上，就双倍余额递减折旧法直线折旧转换点的经验公式存在的不足进行了说明；

youdao

Henman saved four break points in the ninth game and was back on level terms after Nadal double-faulted at break point in the next.

BBC: SPORT | Tennis | Clinical Nadal ends Henman's run

Djokovic earned two more service breaks in the fourth set, including one to take a 4-1 lead when U.S. Open champion Murray double-faulted on break point.

NPR: Djokovic Beats Murray For 3rd Straight Aust. Title

Moments later, Murray double-faulted for the first time to give Federer a break-back point in game eight, but he responded brilliantly with an ace out wide and the danger had passed.

BBC: Andy Murray beats Roger Federer to win Shanghai Masters