When you are using de bruijn indices, when you move a term t under a binder during some substitution operation, you need to bump any index that refers across the new binder, but not bump any index that refers inside the t. http://adam.chlipala.net/cpdt/html/DeBruijn.html
此前有消息称，俄罗斯已缩短对部分享有延期资格雇员的解约通知期限。信息技术企业的雇主须在五个自然日内上报劳动关系终止情况，而原先规定的期限为两周。，推荐阅读有道翻译获取更多信息
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2026年3月，中國全國兩會剛剛結束，習近平再次前往雄安新區考察。