retractility
(anthropology) A social relationship that allows one person to tease or mock another in a way that would otherwise be viewed as inappropriate.
plural of adverse impact
(music) an instrument that produces a concert pitch of B♭ when a C is written in the music
The quality of being retractile.
ヘビの牙が引っ込む性質は、使用していないときの損傷を防ぐのに役立つ驚くべき適応だった。
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