// 易错点2：用Math.ceil/Math.floor取整 → 破坏时间比较逻辑，必须精确计算
2020年10月，正在广东考察的习近平总书记登上广济楼，远眺凝思。
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Instead of filtering syscalls to the host kernel, gVisor interposes a completely separate kernel implementation called the Sentry between the untrusted code and the host. The Sentry does not access the host filesystem directly; instead, a separate process called the Gofer handles file operations on the Sentry’s behalf, communicating over a restricted protocol. This means even the Sentry’s own file access is mediated.