All financial contributions to a district activity are to be strictly voluntary.
所有对地区活动的财务捐献也一定必须是出于自愿的。
The community voluntary service has become main form of American adolescents' voluntary activity.
社区志愿服务已成为美国青少年开展志愿活动的主要形式。
The community voluntary service has become main form of American adolescents' voluntary activity.
社区志愿服务已成为美国青少年开展志愿活动的主要形式。
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