1. We can follow the history of life through the strata.
    我们可以通过这一层层的地层跟踪生命的历史。

2. 911查询·英语单词

2. Tramps are in a low stratum of society.
    流浪汉生活在社会的下层。

1. 地层：进食时一定非常血腥 [编辑本段][生存时期] 时代:白垩纪晚期(晚白垩世 late Maastrichtian ) [编辑本段][物种分布] 分布( Found in)→ 加拿大艾伯塔省 美国新墨西哥州 蒙大拿州 科罗拉多州 怀俄明州等 发现地层( Stratum)→ ...

2. 公共查询·英语单词

2. 层：.数据层(Layer) 集成到一起的面域分布空间数据集,它用于表示一个主体中的实体,或者有一公共属性或属性值的空间对象的联合(Association.层(Stratum) 在有序系统中数据层、级别或梯度序列;

3. 发现地层：-黄昏鸟(Hesperornis) 这种巨鸟使用它的牙齿比使用其翅膀更多 情报(INFOrmation) 中文名称( Chinese)→ 黄昏鸟 时代( Period)→ 白垩纪晚期 early Campanian 分布( Found in)→ 美国 堪萨斯州 发现地层( Stratum)→ 上白垩统海相沉

1. 社会阶层
    A stratum of society is a group of people in it who are similar in their education, income, or social status.

    e.g. It was an enormous task that affected every stratum of society...
           这是一项影响到社会各阶层的重大工作。
    e.g. The rebels came overwhelmingly from the poorest strata of rural society.
           叛乱分子绝大多数来自农村的最贫困阶层。

2. 岩层
    Strata are different layers of rock.

    e.g. Contained within the rock strata is evidence that the region was intensely dry 15,000 years ago.
           岩层中有证据表明，该地区在 15,000 年前曾经非常干旱。

1. an abstract place usually conceived as having depth

    e.g. a good actor communicates on several levels
           a simile has at least two layers of meaning
           the mind functions on many strata simultaneously

    Synonym: levellayer

2. people having the same social, economic, or educational status

    e.g. the working class
           an emerging professional class

    Synonym: classsocial classsocio-economic class

3. one of several parallel layers of material arranged one on top of another (such as a layer of tissue or cells in an organism or a layer of sedimentary rock)