Twelve potential vaccines are currently being tested on humanvolunteers.
12种潜在疫苗目前正在人体志愿者身上测试。
《柯林斯英汉双解大词典》
2
Volunteers formed a human chain to rescue precious items from the burning house.
志愿者排成一条长龙,从着火的房子里手传手把贵重物品抢救出来。
《牛津词典》
3
While Israel was firing, four international volunteers - so-called human shields -stood their ground. Wearing fluorescent vests they recorded the incident on small video cameras.