muck-up day
(Australia, informal) The final day of the senior school year, when departing pupils sometimes play pranks.
plural of dead ball
plural of laika
A person who tunes a piano or organ. / A device, electronic or mechanical, that helps a person tune a musical instrument by showing the deviation of the played pitch from the desired pitch.
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DiQt（ディクト）
無料
★★★★★★★★★★
