The Gartner Group however estimates that 75% of attacks are at the web application layer, and found out "that out of 300 audited sites, 97% are vulnerable to attack".

Gartner组织估计大约75%的攻击都是在web应用，并且在300个调查的web应用里，97%都是容易被攻击的。

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For defending denial of service attack and ports scanning, we adopt corresponding measures in network layer and transport layer.

对于防御拒绝服务攻击与端口扫描，我们在网络层与传输层分别采取相应的措施进行防范。

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This pattern can provide an additional layer of security, and limit the attack surface of the system.

这种模式可以提供一个额外的安全层，并限制了对系统的攻击。

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In MS, the protective sheath or layer around nerves, called myelin, comes under attack which, in turn, leaves the nerves open to damage.

BBC: Simple eye scan can reveal extent of Multiple Sclerosis

By the time the makers of cigarettes were fighting against legislation on secondary smoking and the makers of chlorofluorocarbons against regulations to protect the ozone layer, their efforts had coalesced into a general attack on the environmental movement and the regulatory bodies it had brought into being.

ECONOMIST: A question of dodgy science

You'd think electronic financial trading would be extra secure, but not so much: One of the most popular application-layer protocols in the financial industry leaves these money applications wide open to attack, according to researchers.

FORBES: Hacking Capitalism