Valavu yotulutsa mpweya, valavu yamapiri
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Valavu yotulutsa mpweya, valavu yamapiri
Valavu yotulutsa mpweya-liwiro imaphatikizidwa ndi magawo awiri a ma valavu okwera kwambiri a diaphragm komanso valavu yopukutira ndi valavu yotulutsa, imatha kutulutsa ndi kutulukitsa komanso kudya.