名词
中文翻译：三元数
同义词：
['triangular number', 'trinomial number']
例句：
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1.The ternary number is the sum of three consecutive integers.
三元数是三个连续整数的和。
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2. In mathematics, ternary numbers are used to represent sets of three elements.
在数学中，三元数用于表示三个元素的集合。
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3. The ternary number can be found by adding up all the integers from 1 to n-1.
三元数可以通过将所有从1到n-1的整数相加来找到。