地底 diˋ diˇ

(Nadir, Point, Underground)

Underground, Nadir, The point on the celestial sphere directly below the observer

底下 diˇ xiaˋ

(Beneath, Down, Under, Underneath)

Beneath, Under, Underneath, Down

地

Earth, Ground, Land, Place, Region, Situation, Soil, Territory

Earth, Ground, Soil, Region, Land, Place, Territory, Situation, (De5)

底

Background, Base, Bottom, Underside

Bottom, Underside, Base, Background

下

After, Below, Beneath, Down, End, Finish, Get Off, Get down, Inferior, Under

Below, Beneath, After, Down, End, Under, Finish, Inferior, Get down, Get Off