keyhole
bond; key
【计】 K; key; keyt
【化】 key; linkage; spline
【医】 bond; key; linkage
aperture; bore; foramen; hole; os; ostium; vulva
【化】 hole; opening
【医】 apertura; aperturae; aperture; bore; coel-; foramen; foramina; hiatus
mesh; opening; pore; Pori; porosity; porus; trema