Kedu ka esi eme ihe mgbajiri isi okpukpu abụọ?

N'oge usoro ịkwasa bolt nwere isi okpukpu abụọ, ihe mkpuchi ahụ nwere ike ịgbaji. Ọ bụrụ na oghere ahụ ekpughere, gbalịa iji ngwa ngwa siri ike machie ya ma tụgharịa bolt nwere isi okpukpu abụọ. Ọ bụrụ na ihe mkpuchi nwere isi okpukpu abụọ na-agbaji n'ụzọ concave na akụrụngwa ahụ, iji ntụmadị tinye ike ntụgharị ma ọ bụ ịkụnye oghere n'ime akụkụ obe nke bolt nwere isi okpukpu abụọ iji tinye ngwá ọrụ pụrụ iche nwere ike inye aka na mwepụ.