Ama-valve ebhola lensimbi ye-Carbon ayizingxenye ezibalulekile ekusetshenzisweni kwezimboni ezihlukahlukene, aziwa ngokuhlala isikhathi eside, ukwethembeka, kanye nokusebenza kahle ekulawuleni ukugeleza koketshezi. Njengoba izimboni ziqhubeka nokuthuthuka, isidingo samavalvu ebhola esezingeni eliphezulu sesikhulile, okuholele ekwenyukeni okukhulu kwenani...
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