voluntary participation

• 自愿参与

voluntary participation的用法和样例：

例句

1. But it is voluntary, leading some critics to say banks taking part are stigmatized.
   但这是银行自愿参与的，一些批评人士对此表示，参与计划的银行会因此蒙羞。
2. But a former senior official in Luochuan's health bureau says participation has not been as voluntary as officials make it out to be.
   但是，洛川县卫生局的一位高层官员透露，自愿参与投保的人数比政府公布的要少得多。