dis·pens·able /dɪˈspɛn(t)səbəl/
(a.)不是必要的,可有可無的
Dis·pen·sa·ble a.
1. Capable of being dispensed or administered.
2. Capable of being dispensed with.
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dispensable
adj : capable of being dispensed with or done without;
"dispensable items of personal property" [ant: indispensable]