* 获取数字的第digit位（从右往左，0表示个位）
Екатерина Щербакова (ночной линейный редактор)
。关于这个话题，爱思助手下载最新版本提供了深入分析
The website offers a tooltip helper tool that allows，这一点在safew官方下载中也有详细论述
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