地质时期

But as the special geological condition,irrigation causes a series of problems of agroecological geology,such as landslide,salination and so on.

长时期的引水灌溉使土壤理化性质发生改变，并由此引发了地裂缝、滑坡等地质灾害，同时地下水水位的上升，使地表土壤盐渍严重。

Based on the previous researches, combined with the further understanding of the present oil\|gas exploration, the exploitation of the Junggar basin, the analysis of the sedimental strata characteristics in different stages and the mountains profiles on the margin of the Junngar basin, it is considered that there are three\|period foreland basins formed since the Permain in Junggar basin.

基于前人的研究成果，结合在准噶尔盆地油气勘探开发实践中取得的新认识和对准噶尔盆地周缘盆—山耦合区带地质剖面及盆地不同时期沉积地层特征的分析，认为该盆地自二叠纪以来发育了3期前陆盆地，这3期前陆盆地及与其相关坳陷的组合和叠加是形成准噶尔盆地丰富油气资源和多样化成藏模式的主要原因。

Stable isotopic compositions of carbon and oxygen in marine carbonates formed during geological history has long ...

地质历史时期碳酸盐岩氧、碳同位素组成的研究是目前国际上同位素地球化学研究中的一项重大课题。

Evolutionary radiation of the biotas accompanied with a series of geological events, such as lithospheric thinning, magmatic activities, metamorphic core complex and extensional basins, which suggests a mechanism of interaction and response in the Earth surface systems.

它们的快速演变过程和华北克拉通上同时期发育的岩石圈减薄、大面积强烈岩浆活动、变质核杂岩及伴随的伸展盆地等地球表层重大地质事件并行发生，表现着地壳表层系统圈层间的相互作用和响应。

The use of geoscientific elements and methods in the study of farmland soil ecological environment has become one of the important contents for geological work at present days.

运用地球科学的原理与方法研究农田土壤的生态环境已成为新时期地质工作的重要内容之一。

One of the segments of a compound leaf.

地质上的分期，指岩石形成的时期。

We have no common name for a mime of Sophron or Xenarchus and a Socratic Conversation; and we should still be without one even if the imitation in the two instances were in trimeters or elegiacs or some other kind of verse--though it is the way with people to tack on 'poet' to the name of a metre, and talk of elegiac-poets and epic-poets, thinking that they call them poets not by reason of the imitative nature of their work, but indiscriminately by reason of the metre they write in.

索夫农 、森那库斯和苏格拉底式的对话采用的模仿没有一个公共的名称；三音步诗、挽歌体或其他类型的诗的模仿也没有——人们把&诗人&这一名词和格律名称结合到一起，称之为挽歌体诗人或者史诗诗人，他们被称为诗人，似乎只是因为遵守格律写作，而非他们作品的模仿本质。

The relationship between communicative competence and grammar teaching should be that of the ends and the means.

交际能力和语法的关系应该是目标与途径的关系。