The 10 Scariest Things About NBA중계
https://www.evernote.com/shard/s470/sh/70ae84a3-058c-4211-8b43-9d78644b3b01/fa6c1c28269a3b7d28db25b9535318c8
CCS movie methods can be both covert or overt. Covert video would not let subjects to understand They may be below surveillance, whilst overt video does.