我的客户中只有志愿者自愿使用免费的个性化购物服务。
Onliest of my client's volunteers consistently used free individualistic shopping services.
在大规模的人体临床试验中，该疫苗并没有保护自愿者免受致命病毒的侵害，实际上它对大量的志愿者没有效果。
Instead of protecting volunteers from the deadly virus, the vaccine actually ended up infecting numerous participants during its large scale clinical trial on humans.
他们本着自愿的原则，以志愿服务的形式，在北京奥运会志愿者行动项目体系内工作。
These people operate on the basis of free will, in the form of volunteer service and within the system of the Bejing Olympic Volunteer Program.
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