英文關鍵字
assistant
boys
child
children
chladni
dancing
discovery
drawing
education
experiment
figure
fraction
group
hear
hearing
interesting
kid
kilohertz
laboratory
little
look
looking
loudspeaker
magnetism
man
motion
moving
museum
music
ornament
physical
physics
picture
plate
playing
reaction
sand
school
science
scientific
scientist
see
sound
speaker
study
surface
technology
vibrate
vibration