永久性负债

adult teeth(permanent teeth)

permanent normal trading relations (PNTR)

permanent dipole moment

permanent quadrat method

permanent joints at the ends of heat exchanger conduits

permanent hearing loss

perennial lake【水文】 地理;permanent lake【水文】 地理

airglow【地物】;light-of-the-night-sky【地物】;permanent aurora【地物】