A favorite question at trial lessons, is if there is trapping, as Wing Chun was one of Bruce Lee's earliest martial art.
Trapping has been categorised as Secondary as we have found simpler ways to get the job done. Students should train primary tools that can end a fight fast.
Trapping hands alone is a routine to practice. Trapping in application has a lot more bio-mechanical science involved.
Footwork, centre line management, Dynamic changing of Attack Angles. And most importantly, not "sticking" more than necessary.
This video is my student doing a simple pressure test after drilling his technique for half a lesson.