a small rectangular free-reed instrument having a row of free reeds set back in air holes and played by blowing into the desired hole
例句
用作名词 (n.)
The harmonica is of very high quality. 那个口琴质量很好。
He played a tune on his harmonica. 他用口琴吹奏了一支曲子。
He also made the first pair of bifocal glasses and invented a musical instrument called the glass harmonica and the stepladder chair. 他还制造了第一双双焦眼镜,发明了玻璃琴和活梯椅乐器。