【化】 pitch of holes
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
【计】 GAP; separation distance; space between
【化】 spacing; step
【医】 interval; spacing