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* 获取数字的第digit位（从右往左，0表示个位）。关于这个话题，服务器推荐提供了深入分析
。业内人士推荐Line官方版本下载作为进阶阅读
* Each solid progress should be committed in the git repository.，详情可参考51吃瓜
The US military mistakenly shot down a Customs and Border Protection (CBP) drone near the Mexican border in a strike that reportedly used a laser-based anti-drone system. The CBP uses drones to track people crossing the border.