strict是什么的词根

！strict是restrict的词根，中文意思是v. 限制，控制（大小、数量、范围）；限制（活动或行为），妨碍；约束，管束；（以法规）限制；封锁（消息）

They might also want to restrict the network traffic in and out of their system, so that only the traffic from trusted sources can enter their system and only authorized traffic can go out.