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复数形式
concertinas
1
六角手风琴, 六边形手风琴
a small polygonal instrument that resembles an accordion which is played by pressing keys and pulling and pushing its sides
A concertina is a small, hand-held accordion-like instrument with a hexagonal or oval shape. It consists of a set of metal reeds inside a bellows. When the bellows are pushed or pulled, air flows through the reeds, creating sound. The instrument has buttons on both ends that control which reeds are played, allowing the musician to produce a range of notes. Concertinas are used in various musical styles, including folk, traditional, and classical music, and are known for their distinct, expressive sound and portability.
2
蛇腹形铁丝网（用作障碍物的卷曲带刺铁丝）, 螺旋带刺铁丝
coiled barbed wire used as an obstacle