它可以对网站进行扫描，监测其是否有不正常的行为或是否存在已知的恶意行为，并阻挡用户访问这些站点。
These services scan for Web sites exhibiting unusual behavior or known malicious activity and block those sites from users.
及时的救助计划可以暂时阻挡灾难的发生，它还是会造成巨大的问题——道德风险：如此明显的安全网会鼓励冒险行为。
Even if it staves off disaster, the bail-out will cause huge problems. It creates moral hazard: such a visible safety net encourages risky behaviour.
在第二和第三种行为中，井底的碳水化合物冲破了阀门的阻挡之后，责任的焦点就转移到Transocean的身上。
In the second and third ACTS, after the hydrocarbons had got through valves at the bottom of the well, the focus shifts to Transocean.
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