Different types of viruses, their code varies widely, and the virus production technology is constantly improving, the virus is always ahead of anti-virus software.

不同种类的病毒，它们的代码千差万别，而且病毒的制作技术也在不断的提高，病毒永远超前于反病毒软件。

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This assumption, though safe for various static analyses for compiler optimizations, could spell doom for an anti-virus technology by increasing the time and space costs of the analyses.

这个假定，虽然对编译器最优化使用的各种静态分析来说是安全的，但是由于增加了时间和空间的代价，会致反病毒技术于不利处境。

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As a new anti - virus, anti - tumor drug, antisense nucleic acid's application has been given more and more attention, but the research of antisense nucleic acid technology also faces some challenges.

反义核酸作为一种新的抗病毒、抗肿瘤药物，它的应用受到越来越多的重视，但反义核酸技术的研究也面临一些挑战。

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Easy to set up and use, it includes built-in anti-virus and spam-fighting technology and 99.9 percent uptime guarantee.

ENGADGET: Sprint to begin offering Microsoft Office 365 for enterprise clientele

Yet ironically, as Microsoft slowly improves the security of its products by, for instance, incorporating firewall technology, anti-virus systems and spam filters its actions increasingly start to resemble those that, in the past, have got the firm into trouble with regulators.

ECONOMIST: Microsoft

In August this year Qihoo 360 Technology, an anti-virus software company, launched a competing search engine.

BBC: Baidu's logo