Part of what a person owed the state was military service and the word used to describe these six groups evolved out of the same word used to mean a soldier was being “called up.”

臣民要为城邦服兵役，曾经用来指称这六个等级的单词和另一个意为“征召”（士兵）的词具有相同的词源。

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Part of what a person owed the state was military service and the word used to describe these six groups evolved out of the same word used to mean a soldier was being "called up."

而罗马社会中，人们对社会的义务是兵役。用来描绘这六个阶层的词语，也是从表示士兵被“召唤”的同一词语中产生。

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According to different research perspectives, these branches of learning disciplines can be divided into six groups.

依据研究视角的差异对这些学科进行梳理，可以将它们相对地划分为六组。

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These six groups are nursing home residents, people with chronic medical conditions like asthma, the elderly, pregnant women, health care workers, and children from ages 6 months to 2 years, Butler said.

CNN: Flu vaccine attitudes abroad differ from U.S.

In some of these states, there are four, five, six of these groups up at a time.

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We would need more evidence that more than these six key, target high-risk groups that are prioritized can benefit.

CNN: Flu vaccine attitudes abroad differ from U.S.