We rely entirely on voluntary contribution.
我们全靠自愿捐赠。
Most Americans advocate the spirit of social service and voluntary contribution.
大多数美国人提倡社会服务和志愿贡献的精神。
He is making voluntary contribution.
他自愿地做贡献。
The personal contribution ratio is voluntary in the annuity program.
企业年金中个人缴费比例是自愿的。
The personal contribution ratio is voluntary in the annuity program.
企业年金中个人缴费比例是自愿的。
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