永久凍土

permafrost

forever / always / perpetual

everlasting / perpetual / lasting / forever / permanent

(long) time / (long) duration of time

to freeze / to feel very cold / aspic or jelly

frozen earth / permafrost / tundra

Tu (ethnic group) / surname Tu

earth / dust / clay / local / indigenous / crude opium / unsophisticated / one of the eight categories of ancient musical instruments 八音[ba1 yin1]