Opening a big, black notebook filled with diagrams and tiny writing, he showed how he computed the amount of each gas the doctors in his group practice used.
Wavula inothibhuku enkulu emnyama, egcwele imifanekiso nemidwebo nemibhalo emincane, wakhombisa ukuthi wayibala kanjani inani legesi elasetshenziswa awodokotela ayesebenzisana nabo.