volunteer
n. / v.志愿者；自愿做某事
a person who freely offers to help without payment; to offer to do something without being asked
例句
She volunteered to help clean up the park last weekend.
上周末她主动报名清理公园。
Many students became volunteers for the school sports day.
许多学生成了校运会的志愿者。
怎么记
volun（自愿）+teer→自愿者
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