med du mi rung ba

indispensable [RY]

cannot be done w/o, indispensable, essential [IW]

(to be) indispensable/ sine qua non [RB]

necessary; required [RY]

indispensable, cannot do without, indispensable, essential, essential, cannot do without; indispensable; sine qua non [RY]

indispensable [JV]