名词
中文翻译：积极集
同义词：
['positive set', 'positive set of elements', 'positive set of points']
例句：
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1.In mathematics, a positive set is a collection of numbers that can be ordered in ascending or descending order.
在数学中，一个正集合是由可以有序排列的数组成的集合。
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2.The positive set of real numbers includes all the real numbers greater than zero.
实数的正集合包括所有大于零的实数。
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3. The positive set of points in a plane is the set of all points that lie above the origin.
平面上点的正集合是所有位于原点上方的点。