单词：natural number
natural number的用法和样例：
例句
- Today we are going to classify natural numbers by seeing how many divisors they have.我们学习根据一个数约数的个数来对自然数进行分类。
- The cover pebbling number for lexicographic product graphs and some strong product graphs were determined.对一个图而言，满足此条件的最小的自然数即为此图的覆盖数。
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