Since new viruses are created every day, you must keep the antivirus signature database as current as possible to ensure effectivescanning.
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。
2
Instead of it, the scanning converting technique is an effective way to improve the quality of the picture in current TV transmission.
因而扫描转换技术已经成为现行电视传输方式下改善图像质量的一种有效方法。
3
On the basis of analyzing several methods of getting the target's orientation in rosette scanning system, a simple but effective method is presented in this paper.