はん閉鎖 へいさ しきリブリーザーであれば
han'e isa shiki riburiizādeareba

Noun
Da Copula

The "-eba" conditional form ("if/when…") of 半閉鎖式リブリーザー

1. If it were a semi-closed circuit rebreather; If it is a semi-closed circuit rebreather

Ba Conditional