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необязательное членство meaning in English

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optional membership
RussianEnglish
членство noun
{n}

affiliation [affiliations](The relationship resulting from affiliating one thing with another)
noun
[UK: ə.ˌfɪ.li.ˈeɪʃ.n̩] [US: ə.ˌfɪ.li.ˈeɪʃ.n̩]

membership [memberships](fact of being a member)
noun
[UK: ˈmem.bə.ʃɪp] [US: ˈmem.bər.ˌʃɪp]