英文關鍵字
man
demonstration
indoors
explaining
gesturing
bearded
presentation
educational
informative
design
functionality
daytime
standing
pointing
showing
communication
nonverbal
holding
simplicity
stationery
clarity
instructional
英文關鍵字
man
demonstration
indoors
explaining
gesturing
bearded
presentation
educational
informative
design
functionality
daytime
standing
pointing
showing
communication
nonverbal
holding
simplicity
stationery
clarity
instructional