Membership of an organization is the state of being a member of it.
例句
The country has also been granted membership of the World Trade Organisation...这个国家也被准予加入世界贸易组织。He sent me a membership form...他寄给我一份入会登记表。
N-VAR-COLL
全体会员(或成员);全体会员(或成员)人数
The membership of an organization is the people who belong to it, or the number of people who belong to it.
例句
The European Builders Confederation has a membership of over 350,000 building companies.欧洲建筑商联合会拥有逾35万家建筑公司会员。...organizations with huge memberships.会员队伍庞大的组织