可信签名数据库(TSD)。
由于每天都会产生新病毒，您必须尽量使防病毒签名数据库保持为最新，以确保有效的扫描。
Since new viruses are created every day, you must keep the antivirus signature database as current as possible to ensure effective scanning.
其他反病毒产品的依赖于签名数据库和档案扫描甚至不工作的理论，以防止新的，变异，或有针对性的恶意软件。
Other antivirus products that rely on signature databases and file scanning do not even work in theory to protect against new, mutated, or targeted malware.
其他反病毒产品的依赖于签名数据库和档案扫描甚至不工作的理论，以防止新的，变异，或有针对性的恶意软件。
Other antivirus products that rely on signature databases and file scanning do not even work in theory to protect against new, mutated, or targeted malware.
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