Valavu yoyendetsa nyundo yophwanyidwa ndi gawo lolondola kwambiri.Pakalipano, pali opanga ochepa omwe angapange ku China, kotero mtengo siwotsika.
Pali mitundu yambiri yazinthu zosinthira valavu ya nyundo yophwanyira nyundo.Posankha, makasitomala ayenera kufunsa kaye kuti amapangidwa ndi chiyani, chifukwa ichi ndi gawo lolondola kwambiri, ndipo zinthu zolakwika zimatha kupanga nyundo yonse yophwanyidwa, kotero tikufuna kugula zinthu zapamwamba kwambiri.