Olee otú ị ga-esi eme mgbe ịnakọta ụzụ na mmiri mmiri na-egbu oge n'otu oge ahụ?

A na-egbochi valve ma ọ bụ ịka nká. Biko dochie valloid valvụ ụzọ atọ.

Ndụmọdụ: Biko kpọtụrụ Injin na-ere ahịa iji merie ya.