research fields短语¹⁸⁰⁰⁹⁸⁺¹ 基本例句 研究领域 The theory of random service system has acquired enormous development in past years, and became one of the most vigorous research fields in the applying probability and the random operations research. 其后四五十年间，特别是二次世界大战以后得到迅猛发展，成为应用概率论与随机运筹学中最有活力的研究课题之一。 cnki