dis·pen·sa·ble
adjective/dɪˈspensəbl/
/dɪˈspensəbl/
[not usually before noun]- not necessary; that can be got rid of
不必要；可有可无；不重要 - They looked on music and art lessons as dispensable.
他们认为音乐课和美术课是可有可无的。
Word Originearly 16th cent. (in the sense ‘acceptable in special circumstances’): from medieval Latin dispensabilis, from Latin dispensare ‘continue to weigh out or disburse’, from the verb dispendere, based on pendere ‘weigh’. - They looked on music and art lessons as dispensable.