The low altitude penetration plays a more and more important role in modern war. The airborne digital map is a key subsystem of the modern autonomous low altitude penetration system.

低空突防在现代战争中发挥着越来越重要的作用，而机载数字地图是现代自主式低空突防系统的一个关键子系统。

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Password cracking is a term used to describe the penetration of a network, system, or resource with or without the use of tools to unlock a resource that has been secured with a password.

密码破解是用以描述在使用或不使用工具的情况下渗透网络、系统或资源以解锁用密码保护的资源的一个术语。

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Meanwhile, classroom management needs the guidance of reasonable ideas and technology, the support of material things, the restriction of system and more importantly, the penetration of culture.

同时，课堂管理也需要有合理的观念和技术作指导，它需要有物质层面的支撑、制度层面的规范，更需要有文化层面的蕴涵与渗透。

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'There is concern over the uncertain state of President Yeltsin's health, at the continuing extremely high level of criminal penetration of the financial system and over the impact on Russia of the Asian financial crisis, ' Mr. Goldman said.

CENTERFORSECURITYPOLICY: Center For Security Policy

As smartphones come down in price and achieve greater penetration among the masses, Google says its free Android operating system will allow it to take advantage of the open Web to generate more advertising and search-related revenue.

FORBES: Google's Asia Strategy Hinges On Smartphones