Ọnụ ụzọ ọkụ ọkụ UL na-ezo aka n’ọnụ ụzọ ọkọlọtọ ọkọlọtọ America, nke nwere ike izute ihe achọrọ maka nkwụsi ike ọkụ, iguzosi ike n’ezi ihe na mkpuchi ọkụ n’ime oge ụfọdụ. A ga-edobe ọnụ ụzọ nke ọnụ ụzọ ọkụ UL na enweghị perforation (nnwale ọkụ na mmetụta mmiri).

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