on a voluntary basis 在自愿的基础上
registration on a voluntary basis 自愿登记
a voluntary basis
自愿基础
以上为机器翻译结果，长、整句建议使用 人工翻译 。
She works there on a voluntary basis.
她自愿在那里无偿工作。
《牛津词典》
We run the meals-on-wheels service on a voluntary basis.
我们基于自愿的原则，开展上门送餐的服务。
youdao
In 2005, more than a million people returned to their own country on a voluntary basis.
2005年，一百多万人自愿返回了自己的国家。
This is an inclement climate to make stakeholder pensions a success on a voluntary basis.
ECONOMIST: Workers are not saving enough for retirement
Pension funds are being invited to invest in these plans on a voluntary basis.
ECONOMIST: The investment attractions of infrastructure
Currently academies and free schools are expected to comply with the standards on a voluntary basis.
BBC: School meal rules should apply to academies - parents
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