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1·The recurring decimal 3.999... is also described as 3.9 recurring.

循环小数3.999...亦作3.9循环。《牛津词典》

2·Scores can also be expressed as a finite or infinite decimal recurring decimal.

分数亦可表示为有限小数或无限循环小数。

3·This paper, by studying and guessing, has advanced the concept of the characteristic value of the prime recurring decimal, and given a series of important propositions.

通过研究、猜测，提出了循环小数特征值的概念，给出了一系列重要命题。