adv.永久地
Something that remains perennially fresh, interesting, or well liked. 經(jīng)久不衰的事物常新的、百看不厭的或永保美名的事物
Permanently frozen subsoil, occurring throughout the Polar Regions and locally in perennially frigid areas. 永凍土永久冰凍的下層土壤，出現(xiàn)在整個北極地區(qū)和部分長期寒冷的地區(qū)
