思いの外正確でびっくりした.|「音の速さを見てみよう」 http://link.brightcove.co.jp/services/player/bcpid73869298001?bclid=73983411001&bctid=75124899001
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思いの外正確でびっくりした.|「音の速さを見てみよう」 http://link.brightcove.co.jp/services/player/bcpid73869298001?bclid=73983411001&bctid=75124899001