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Member for
3 ปี 7 เดือนAge: 13-17
Level: 8
Language: English
(en)
ไอดี: 872141
31/03/2021
Country code: US
Country: United States
Main content: Sound (2011479)
From worksheet author:
Basics of Sound, Doppler Effect, reverberation, Decibels.
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