Nmap is an extremely flexible tool that can do active and passivescanning of remote (and local) systems.
Nmap是一个非常灵活的工具，它可以主动或被动地扫描远程(和本地)系统。
2
In this paper, combining the advantages of active light vision technology and passive light vision technology, an optical system of circular scanning laser vision sensor was developed.
本文结合主动光视觉技术和被动光视觉技术的优点，开发了环形扫描激光视觉传感器的光学系统。
3
The type of scanning can be passive, active or user-directed.