n. 1.纪元；年代，时代。 2.【地质学；地理学】代。 短语和例子 inaugurate [mark] a new era 开[划]新纪元。 before [in] the Christian era 公元前[后]。 短语和例子 ERA, E.R.A. ＝ 1.Emergency Relief Administration 〔美旧〕紧急救济署。 2.engine-room artifier 【航海】机舱机电军士。
a major division of geological time; an era is usually divided into two or more periods 同义词：geological era,
a period marked by distinctive character or reckoned from a fixed point or event 同义词：epoch,
An era is a commonly used word for long period of time. When used in science, for example geology, eras denote clearly defined periods of time of arbitrary but well defined length, such as for example the Mesozoic Era from 252 Ma?66 Ma, delimited by a start event and an end event.
例句与用法
1.
Reading opened a new era in my life . 阅读把我的生命引进了新时代。
2.
We are living in a great historic era . 我们正处在一个伟大的历史时代。
3.
It is a memorable portrait of an era . 它是时代不朽写照。
4.
The dust bowl era will return . 尘暴的时代将卷土重来。
5.
It marks the beginning of a new era in human history . 这标志着人类历史新纪元的开始。
6.
The biochemical era in the study of gastrin was initiated . 研究促胃液素的生物化学时代开始了。
7.
We wanted to show the public that a new era had begun . 我们要向公众表明，一个新的时代业已开始。
8.
The beginning of libraries came after the end of the prehistoric era . 图书馆起源于史前时代结束之后。
9.
The charge reveals a profound ignorance of the progressive era . 这一指责表明，他们对进步时代一无所知。
10.
Mammals arose from a fairly primitive reptile in the mesozoic era . 哺乳类起源于中生代宛若原始的爬虫类。
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