The charity is run on a purely voluntary basis.

这个慈善团体的工作人员完全是自愿性质的。

《牛津词典》

Voluntary work can provide a framework for job-seeking.

参与义务工作有助于奠定求职的基础。

《牛津词典》

Attention is drawn to a special voluntary course in Commercial French.

注意力被吸引到一门特别的商务法语选修课上。

《柯林斯英汉双解大词典》

But he went on to underscore the decision to be tested for HIV remained a voluntary and confidential, individual choice.

VOA: standard.2010.04.26

It described the target as a voluntary action, and predicted it would make a "major contribution" to global efforts to deal with climate change.

VOA: standard.2009.11.26

ALS is a deadly disease affecting the motor nerves and the voluntary muscles.

VOA: special.2010.03.09

It said the retail industry had already used a range of different techniques, such as introducing bags for life and other offers, to reduce the use of plastic bags which - led by the UK's leading supermarkets - it had done so by at least 25% since signing a voluntary up to a voluntary scheme to do so in 2007.

BBC: Shoppers may face 20p bag charge

The federal mandate transformed a voluntary expense into a compulsory one, increasing demand exponentially.

FORBES: Why Rating Your Doctor Is Bad For Your Health

The Scottish government's draft RPP distinguishes a voluntary approach from a regulatory one when looking at ways to incentivise businesses and the public to take up the environmental changes they propose.

BBC: Climate change targets debate