我使用了内爆'/‘,但在这种情况下,我想,最后两列iid和branch_id,比如==>>>>,iid."_".branch_id,我是说,对于最后两列,内爆将是'_’下划线,而不是'/‘斜杠,但对于前4列,它将是/,仅对于最后两列,它将是下划线。请帮我找出合适的解决方案。谢谢$switzerland= new Sitemap($switzerlandcodes_sitefile,["name","canton","ci
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