There is also a kind of collective noun which can be used either in the singular or in the plural sense. eg: team, a team, three teams.
另外，这些集体名词还可以用于用于单数意义把集体视为一个整体，用于复数意义指构成构成集体的一个个成员。
This noun appears in the plural form only, never in the singular form. This is a collective noun.
这个名词只以复数形式出现，从来没有单数形式。
Concerning the semantic formula of -men, some linguists (Lu 1947, Chao 1968) posit that -men is a plural marker in pronouns but a collective marker otherwise.
关于其语义特征，吕叔湘（1947）、赵元任（1968）认为“-们”是集合标记，但在人称代词后是复数标记；
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