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voluntary (adj)/ˈvɑː.lən.ter.i//ˈvɒl.ən.tər.i/something is done by choice but is not requiredtự nguyện  Many people attended the voluntary boat safety class. Voluntary contributions from community members support local charities. Participation in extracurricular activities is voluntary for students. Voluntary organizations play a crucial role in disaster relief efforts. Donating blood is a voluntary act that can save lives. Từ vựng khác:sterile , practitioner , paramount , clumsy , billionaire |