The first bit of access control actually happens at login when a PAM module decides that Bob must log in to role cashier_r.

当PAM模块决定bob必须登录到cashier_r角色中时，将实际发生访问控制的第一部分。

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Though Palestinians can travel a bit more freely in the West Bank, the Israelis still control the borders and roads, the air space, energy and communications, access to water, and much else.

尽管巴勒斯坦人在西岸地带通行时较过去自由一些，但以色列人仍控制着边境、道路、领空、能源与通信、水源及其他许多。

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