Hoo-khip hē-thóng sī sing-bu̍t īng lâi tsò khì-thé kau-uānn (gas extsange) ê khì-kuan tsoo-sîng ê hē-thóng. 4 ki kha ê tōng-bu̍t it-puann ū kā khong-khì tsah ji̍p-khì hì ê thong-lōo, tshīunn kóng hì-kńg, tsiah koh tī hì kau-uānn khì-thé; huâinn-keh-mo̍͘h (diaphragm) hū-tsik kā khong-khì khip--ji̍p-lâi, koh kā bô beh ti̍h ê khong-khì sak--tshut-khì. Bô kāng sing-bu̍t ē ū bô siâng ê hoo-khip hē-thóng, liān tshīu-á mā ū hoo-khip hē-thóng.
- Tsit phinn sī uì Hô-ló-pah-kho(Holopedia) ê : "Ho͘-khip hē-thóng" kái lâi--ê. Guân-pún ê tsok-tsiá tshiánn khuànn i ê pian-tsi̍p li̍k-sú.