Tuubbada Shiinaha ee qaboojinta saxan sare leh, oo ah tii ugu horreysay ee si weyn looga isticmaalo warshadaha dhuxusha, haddana waxa lagu kordhiyey warshadaha injineernimada wax soo saarka, saliidda, dhululubo, dhululubo iyo bistoon. Wax-soo-saarka tayada, hufnaanta, aad iyo aad u sarreeya, wax-soo-saarka ayaa sidoo kale sii kordhaya, oo leh ...
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