內循環 [内－环]

Jyutping noi6 ceon4 waan4
Pinyin nèi xún huán

Definitions (Wiktionary)
  1. noun, neologism
    internal circulation (i.e. relying on a domestic cycle of production, distribution, and consumption); self-sufficiency
  2. noun
    internal circulation (as in an air conditioning system); recirculation