необязательное членство означает в английский

optional membership

Русский	Английский
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]

Русский

Английский

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]

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