0.8ร1ร1.2ร1.5ร1.7ร2ร2.5ร21 minโก๏ธ26 min21 min17 min14 min12 min10 min8 min 21 secWorkshop Introduction0.8ร1ร1.2ร1.5ร1.7ร2ร2.5ร21 minโก๏ธ26 min21 min17 min14 min12 min10 min8 min 21 secWorkshop IntroductionYour user agent does not support the HTML5 Video element.