4周搞定2000+托福核心词
album = alb(白色) + um(表物体) = 空白的东西→用来放 东西的册子
albumen = alb(白色) + um(表物体) + en(人或物) = 蛋白
层层扩散→社会阶层
stratum
常考释义
By following the fossils, Smith was able to put all the strata of England's earth into relative temporal sequence.
通过追踪化石，史密斯将英国范围内所有的地层进行了彼此出现时间的排序。
来源于：阅读OFFICIAL6 P2n. [地质] 地层
When archaeologists are digging at a site, they make very careful notes about which stratum (strata), which layer of earth they find things in.
当考古学家在发掘某个坑位时，他们会很注意文物出土的地层，即文物是从地表的哪一个层面被发掘出来的。
By following the fossils, Smith was able to put all the strata of England's earth into relative temporal sequence.
通过追踪化石，史密斯将英国范围内所有的地层进行了彼此出现时间的排序。
来源于：阅读OFFICIAL6 P2Not only could Smith identify rock strata by the fossils they contained, he could also see a pattern emerging: certain fossils always appear in more ancient sediments, while others begin to be seen as the strata become more recent.
史密斯不仅可以通过岩石中包含的化石来识别地层，而且可以看出他们显露出来的模式：一些特定的化石往往出现在更为久远的沉积物当中，而其他的化石则可以在距今年代较近的地层中发现。
来源于：阅读OFFICIAL6 P2Some fossils endured through so many millions of years that they appear in many strata, but others occur only in a few strata, and a few species had their births and extinctions within one particular stratum.
在同一地层中发现的岩石可能在这片地层中属于泥板岩，而在另一片地层中可能是砂岩，而在那些泥板岩或者砂岩中的化石往往都是一样的。
来源于：阅读OFFICIAL6 P2While rock between two consistent strata might in one place be shale and in another sandstone, the fossils in that shale or sandstone were always the same.
而区分其中的化石对史密斯来说简直就是轻而易举。
来源于：阅读OFFICIAL6 P2As he collected fossils from strata throughout England, Smith began to see that the fossils told a different story from the rocks.
史密斯在全英国的岩层中不断搜集化石，后来他发现化石所反映的史实和岩石反映的完全不同，
来源于：阅读OFFICIAL6 P2But as more and more accumulations of strata were cataloged in more and more places, it became clear that the sequences of rocks sometimes differed from region to region and that no rock type was ever going to become a reliable time marker throughout the world.
但是，随着各地越来越多的岩层的积累和分类，岩层顺序也因地区的不同而不同，因此，全世界没有一种特定的岩层能被认作是划分地质年代的标志。
来源于：阅读OFFICIAL6 P2Ever since people had begun to catalog the strata in particular outcrops, there had been the hope that these could somehow be used to calculate geological time.
从人们开始对露出地面的特殊岩层进行分类的时候起，大家就开始认为这些岩石可能会以某种方式被用于计算地质年代。
来源于：阅读OFFICIAL6 P2In 1815 he published the first modern geological map, “A Map of the Strata of England and Wales with a Part of Scotland,” a map so meticulously researched that it can still be used today.
1815年，他绘制了第一张现代地质学地图——《英格兰、威尔士及部分苏格兰地区地层地图》，这张地质地图绘制得非常精确，直到现在仍有参考价值。
来源于：阅读OFFICIAL6 P2Instead, they are other volcano types, like strata volcanoes, for example, which are a result of tectonic plate movement.
相反的，是其他种类的火山，例如，地层火山，是地球板块运动造成的。
来源于：听力OFFICIAL24 L6n. 社会阶层
Tramps are from the lowest stratum of society.
流浪汉来自社会最底层。
n. （组织的）层
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