volunteers例句
The
volunteers kept a record of everything they ate for a week.
志愿者记录下他们一周所吃的所有食物。
Volunteers constitute more than 95% of The Center's work force.
该中心95%以上的工作人员是志愿者.
Twelve potential vaccines are currently being tested on human
volunteers.
目前正在人类志愿者身上试验12种试用疫苗。