| 单词 | voluntary |
| 例句 | voluntary adjective 1.•attendance is voluntary:optional, discretionary, elective, noncompulsory, volitional | Law permissive. ANT compulsory, obligatory. 2.•voluntary work:unpaid, unsalaried, unwaged, for free, without charge, for nothing | honorary, volunteer | Law pro bono (publico). ANT paid. |
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