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In this paper, the petrology, mineralogy and geochemistry of basic-ultrabasic volcanic rock, granite and skarn related to the Sn-Cu skarn-type ore and the vein-type ore in Laochang ore field have been researched systematically, some conclusions are summarized as follows:In Gejiu tin-polymetallic district, the middle Triassic volcanic rocks belonging to calc-alkaline basalt-tholeiite serie, mainly consist of pyroxene, hornblende, feldspar, chlorite and phlogopite; All the granites are peraluminous granites related to the Yanshanian collision-orogeny. Laoka granite closely related to the tin-polymetallic deposits emplaced in the post- orogenic.The metal elements show obviously vertical zones with the variety of skarn types in dimensional extension; The occurrence of garnet skarn and diopside skarn alternately developed in the horizontal zones of the contact between granite and carbonatite are mainly related to two factors: one factor is the infiltration metasomatism of post-magmatic hydrothermal solution, the another is the metrical strata of marble and calcic-dolomite developed in country rocks.

本文重点以老厂矿田中的接触带锡铜矿床和脉状矿床为研究对象，采用化学分析、ICP-MS、X射线粉晶衍射分析、电子探针等测试手段，对本区与成矿相关的基性-超基性火山岩、花岗岩、夕卡岩、电气石-石榴石等进行了系统的地质地球化学研究，研究表明：个旧矿区中三叠纪个旧组地层中的火山岩为钙碱性玄武岩-拉斑玄武岩系列，岩石为辉石-角闪石-长石-绿泥石-金云母组合；本区的花岗岩为过铝质花岗岩，主要与燕山期碰撞造山作用有关，锡多金属成矿与形成时代最晚、分异较好的花岗岩关系密切；本区夕卡岩中的有用共生组份随着夕卡岩类型及其矿物组合的不同具有明显的分带性。

The volume alternately ranges about mezzopiano and pianissimo, until after several almost revealing seconds of forte the pianist has the music retire into a pianissimo mystery in which it would, it appears, remain immersed indefinitely.

音量在中弱音和最弱音之间交替变化几次之后，是几秒钟的强音的抒发，之后钢琴家使音乐恢复到最弱音的神秘境界之中，陷入不确定的沉思。

The pleater uses upper and lower blades to alternately finish the folding,then different pleating heights are acquired evenly and accurately by automatically adjusting the blades distance.

折叠机采用上、下刀交替方式完成折叠工作，刀距通过电脑自动调整，可达到各种不同折高的要求，尺寸准确、平整如一。

In the pre-Christian era, this planet actually had two names, as it was not realized it could alternately appear on one side of the Sun and then the other.

在前基督时代，水星其实有两个名字。原因是当时人们没有意识到它会交替出现在太阳的一边然后是另一边。

Chinese approach sex with an attitude that seems alternately more prudish and more open than that of Westerners.

与西方人相比，中国人对于性的态度表面上假正经，事实上更加开放。

The pattern is extremely simple, with one row purl, and one row and alternately one purl and one knit.

花样其实就只是一行高针，一行则是一针高一针低的，非常简单呢。

A19 line poem of fixed form consisting of five tercets and a final quatrain on two rhymes , with the first and third of the first tercet repeated alternately as a refrain closing the succeeding stanzas and joined as the final couplet of the quatrain .

田园诗一种有固定格式的19诗；由五个三押韵的诗节和一个四诗节组成，其四诗节有二个韵，在第一个三押韵诗节中，第一和第三作为结束后继诗节的重复句间隔地重复出现，并作为四诗的结尾对句一起再现

A19 line poem of fixed form consisting of five tercets and a final quatrain on two rhymes , with the first and third lines of the first tercet repeated alternately as a refrain closing the succeeding stanzas and joined as the final couplet of the quatrain .

田园诗一种有固定格式的19诗；由个三押韵的诗节和一个四诗节组成，其四诗节有二个韵，在第一个三押韵诗节中，第一和第三作为结束后继诗节的重复句间隔地重复出现，并作为四诗的结尾对句一起再现来源：词友

A19 lie poem of fixed form consisting of five tercets and a final quatrain on two rhymes , with the first and third lines of the first tercet repeated alternately as a refrain closing the succeeding stanzas and joined as the final couplet of the quatrain .

田园诗一种有固定格式的19行诗；由五个三行押韵的诗节和一个四行诗节组成，其四行诗节有二个韵，在第一个三行押韵诗节中，第一行和第三行作为结束后继诗节的重复句间隔地重复出现，并作为四行诗的结尾对句一起再现

A 19 line poem of fixed form consisting of five tercets and a final quatrain on two rhymes , with the first and third lines of the first tercet repeated alternately as a refrain closing the succeeding stanzas and joined as the final couplet of the quatrain .

田园诗：一种有固定格式的19行诗；由五个三行押韵的诗节和一个四行诗节组成，其四行诗节有二个韵，在第一个三行押韵诗节中，第一行和第三行作为结束后继诗节的重复句间隔地重复出现，并作为四行诗的结尾对句一起再现

Aquatic or marsh-growing fern allies; known to have existed since the Cenozoic; sometimes included in Lycopodiales.

生活于水中或湿地的蕨类；从新生代生存至今；有时归于石松目之中。

The engine was uprated from a 90hp Franklin to a 125hp Lycoming.

改良过的引擎是从90hp到125hp莱康明富兰克林。