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单词	triangular number
释义	triangular number noun : a number (such as 3, 6, 10, 15) representable by that many dots arranged in rows that form a triangle and that equals {latex}\\frac{n(n + 1)}{2}{/latex} for some positive integer value of n Word History First Known Use 1795, in the meaning defined above
随便看	grindal grindel grindeliae grindelias Grindelwald grinder grinder's green grinderies grinderman grindermen grinders grinding grinding (down) grinding (out) grinding aid grinding along grinding away grinding down grinding mill grinding on grinding out grinding wheel grindingly grindings grindle

英语词典包含469781条英英释义在线翻译词条，基本涵盖了全部常用单词的英英翻译及用法，是英语学习的有利工具。