竞选人约翰·麦凯恩倡导两级制度。

John McCain, the nominee, advocated a two-tier system.

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国家依照法律规定对现役军人和预备役人员实行衔级制度。

The State, in accordance with the provisions of law, applies a system of military ranks among both servicemen and reservists.

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攻击性与仪容是某一物种中地位的标志，但弄清这一等级制度的细节需要长时间的艰苦观察。

Aggression and grooming are indicators of a specimen's status, but figuring out the niceties of the hierarchy require laborious and time-consuming observation.

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