If you make it out of nylon, which has a Young's modulus...
如果是尼龙做的，它的杨氏模量。
The original naive implementation used the modulus (%) operator, which is wildly inefficient, to check every number from 2 up to the target number itself to determine if it is a factor.
原先是简单的使用取模运算符（%）的实现，它非常低效，它自己检查从 2 到目标数的每个数字，确定是否是因子。
If Young's modulus is very high, then the rod is extremely stiff.
如果杨氏模量很大，表示这棒子非常硬。
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