英语语法分析

This is a lucrative business, Symantec has discovered.

赛门铁克发现这是一项合算的生意。

According to Symantec, the volume of spam emanating from the US continues to increase.

据赛门铁克称，从美国发出的垃圾邮件的数量继续增加。

Companies like Symantec assert they can detect and clean even the deepest rootkit infection.

像赛门铁克等公司都宣称它们可以探测和清除即时隐藏最深的rootkit感染。