You are viewing a single comment's thread from:RE: #2 Free 0.18 SBD !!! Follow for follow all!!! #2View the full contexthasan019 (55)in #upvote • 7 years ago upvoted and resteemed. https://steemit.com/health/@hasan019/why-can-we-hear-in-the-frequency-range-20-hz-to-20-khz-only
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