它包含一个控制访问对象的安全核心，位于其上的是一些实现基本功能的模块，如加密和数字签名、证书管理、安全会话、数据密封等。

On top of the kernel are some modules which implement basic functions, such as encryption, digital signature, certificate management, secure session and data enveloping.

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它们是全球经济的关键动力，是美国的重要合作伙伴，并正在日益成为该地区和平与安全的核心贡献者。

They are key drivers of the global economy, important partners for the United States, and increasingly central contributors to peace and security in the region.

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反应堆安全的核心是一个聪明的燃料设计。

At the core of the reactor's safety is a clever fuel design.

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