The kinds of "flood" denial of service attack are easy to he detected, but difficult to prevent, because they use the simple, nature, "normal" way to attack.

各种“洪水式”拒绝服务攻击比较容易检测，但却难于防范，因为它们是通过一种简单、自然、“正常”渠道发起的攻击。

youdao

The main advantages include better session key management, improved security, greater availability, anti denial of service attacks and simple authentication.

新结构在密钥管理、全可靠性以及认证方法方面都比传统的结构有较大的改进。

youdao

"This simple point seems to have been lost in what I think is a fog of denial and sometimes apparently wilful misunderstanding, " she told MSPs.

BBC: Offensive Behaviour at Football stage 3 debate