valToGreater2.set(cur, stack2.length ? stack2.at(-1) : -1);
경복궁도 문 닫게 만든 BTS 광화문 공연… 26만명 몰린다
，这一点在safew官方版本下载中也有详细论述
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Source: https://firebase.google.com/support/guides/security-checklist#api-keys-not-secret