Tools such as Razor and Pyzor (see Resources) operate around servers that store digests of known spams.

象 Razor 和 Pyzor（请参阅 参考资料）这样的工具运行在服务器一端，服务器上存储了一些已知垃圾邮件的摘要。

youdao

Electricity comes fitfully: a huge headache for factories that need to operate around the clock to turn a profit.

电力供应时断时续，这让争分夺秒创收益的工厂头痛不已。

youdao

youdao

He and his family operate houseboats and cater to tourists from around the world.

VOA: standard.2009.12.16

The hospitals, chosen because of their similarities to the Friarage, also operate around-the-clock consultant-led maternity and children's services.

BBC: Report 'backs' fight to retain Friarage Hospital services

The unit will operate around the clock providing high profile traffic enforcement on major national routes including motorways.

BBC: New Scots-wide road policing unit unveiled

Electricity comes fitfully: a huge headache for factories that need to operate around the clock to turn a profit.

ECONOMIST: Indian textiles