参与者名称通常是单数名词，譬如，年级管理员、客户以及支付出纳员。
Actor names are usually singular nouns such as Grade Administrator, Customer, and Payment Processor.
后一种用法开始只限于单数名词。
名词“ action ”是单数，他是“ actions ”的单数形式。
The noun "action" is singular; it is the singular form of "actions".
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