The principles of Historic districts's protection, include integrated protection, sincerity coexist, hierarchical protection, and apposite update.
历史街区应采用整体保护、真实共存、分级保护、适度整治更新的保护原则。
In order to keep data at rest from being accessed, stolen, or altered by unauthorized people, security measures such as data encryption and hierarchical password protection are commonly used.
为了防止静止数据被不法人士存取、窃取或修改，通常采取一些安全措施，如数据加密和分等级的口令保护。
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