How do you pronounce 下界?

Q: How do you pronounce 下界? A: haa6 gaai3, e.g.

下界 (haa6 gaai3) — meaning, pronunciation, examples

下界 (haa6 gaai3, xià jiè) — lower bound (math.); world of mortals; (of gods) to descend to the world of mortals

下下 (haa6 haa6) — often; always; regularly (spoken)
下世投胎 (haa6 sai3 tau4 toi1) — reincarnation
下中農 (haa6 zung1 nung4) — Low-middle class peasant
下乘 (haa6 sing6) — Inferior;bad quality
下人 (haa6 jan4) — servant
下低 (haa6 dai1) — (adverb; preposition) under; below; underneath; lower