旋回

Stratabound deposits in Archeozoio era: of the early Archeozoic, there are Qianxi iron ore deposit in volcanic and sedime...

层控矿床的成矿时代，由于其成矿的复杂性和成矿时间的不确定性，我们只能以地质一构造的巨旋回为准，分为太古宙、元古宙和显生宙的古生代和中-新生代四期。

This sedimentary basin, with repeated cycles of arenaceous, argillaceous and carbonate rocks was developed in the margin of the Eastern Ghat mobile belt.

该盆地发育于Chat活动带东部边缘，并发育沙质、粘土质和碳酸盐岩的多期重复沉积旋回。

The evolution history of multicycle in Tarim Basin is determined by long distance drifted small plates,complicated basement and complex tectomic activities of the neighbouring plates.

长距离漂移的小板块、条块分割的基底结构和相邻板块的复杂作用控制了塔里木盆地多旋回的演化历史。

By summing up the cyclicity, rock association and occurrence of volcanic rocks with their overlying and underlying contact relations and forming environment, and concerning the research results of isotope chronology and biostratigraphy, the Yixian formation of the working area may be subdivided into four members.

综合火山岩的旋回性特徵，岩石组合、岩石产出特徵，不同岩石组合的上、下接触关系和岩石形成环境的分析结果，结合同位素年代学及生物地层学的研究成果，区内义县组被划分成了4个岩性段。

This paper systematically describes the Lower Triassic stratigraphic sequence of the section and summarizes the up-to-date achievements in the lithostratigraphy, biostratigraphy, magnetostratigraphy, carbon and oxygen isotopes stratigraphy, and cyclostratigraphy.

系统记述了该剖面的地层序列，包括岩石地层、生物地层、磁性地层、碳氧同位素地层和旋回地层等方面的最新研究成果。

Some geoscience experts put forward a subject of "past global change"to settle the problem that what change will occur in the earth surface environment under the durative influence of the greenhouse effect. The subject is expected to provide a reference system to forecast the future global change through the study on the typical Quaternary climate gyration, especially the study on the climatic environment pattern of the calefacient period.

为了研究在温室效应的持续影响下，未来增温时期的地球表面环境会出现何种改变，一些地球科学家提出了"过去全球变化"的研究课题，以期通过对第四纪时期典型的气候旋回(冷-暖和干-湿的交替变化)，特别是增温期的气候环境格局的研究，为预测未来的全球变化提供一个参照体系。

A relationship among sequence, base level cycles and the overriding style of reservoir sand is established through an analysis of the change of base level during the formation of seismic sequence.

通过基准面在层序地层发育过程中的变化分析，建立了层序地层、基准面旋回和储层砂体叠加方式的对应关系。

Based on the principles that the cyclic change of base level controls the formation and distribution of sequences and in combination with the comprehensive analyses of drilling, logging and seismic section, the Ordovician sequence stratigraphic framework in Tazhong area is established.

根据基准面旋回变化控制层序形成和展布的有关规律，并结合钻井、测井和地震等资料，综合分析建立了塔中地区奥陶系的层序地层格架，共包括5个三级层序。

But as I struggled to explain concepts such as, say, the albedo effect, chlorofluorocarbons and the Milankovitch cycles, I was forever troubled by a central question: what is the right age to tell a child about climate change?

但是，当我绞尽脑汁地解释诸如阿比多效应，氟氯碳，以及米兰柯维奇旋回等概念的时候，有一个问题却使我困扰不已：在孩子多大的时候告诉他们关于气候变化的问题合适？

Objective To investigate the diagnostic value of conventional spin echo in combination with cine MRI in congenital heart disease.

目的 探讨常规自旋回波结合电影MRI对先天性心脏大血管畸形的诊断价值。

It has been put forward that there exists single Ball point and double Ball points on the symmetrical connecting-rod curves of equilateral mechanisms.

从鲍尔点的形成原理出发，分析对称连杆曲线上鲍尔点的产生条件，提出等边机构的对称连杆曲线上有单鲍尔点和双鲍尔点。

The factory affiliated to the Group primarily manufactures multiple-purpose pincers, baking kits, knives, scissors, kitchenware, gardening tools and beauty care kits as well as other hardware tools, the annual production value of which reaches US$ 30 million dollars.

集团所属工厂主要生产多用钳、烤具、刀具、剪刀、厨具、花园工具、美容套等五金产品，年生产总值3000万美元，产品价廉物美、选料上乘、质量保证，深受国内外客户的青睐