第二類永動機 [－－类－动机]

Jyutping dai6 ji6 leoi6 wing5 dung6 gei1
Pinyin dì èr lèi yǒng dòng jī

Definitions (Wiktionary)
  1. noun
    perpetual motion machine of the second kind (perpetual motion machine that spontaneously converts thermal energy into mechanical work)