#noindex
##======메아리,echo =,echo 메아리 echo
https://ko.wikipedia.org/wiki/메아리
[[WpSp:Echo_(acoustics)]] = https://simple.wikipedia.org/wiki/Echo_(acoustics)
[[WpEn:Echo]] = https://en.wikipedia.org/wiki/Echo

isa [[소리,sound]] [[반사,reflection]]