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Their source is the Archean Group. 它们皆为S型，其源岩为太古界。
The Archean Group sedimentary metamorphic iron ore to the north and north-east of Tangshan lies shallow in the earth, is large in scalc and easy to grind and process. 唐山北部和东北部太古界沉积变质铁矿埋藏浅、规模大、矿石易磨易选。
Gold mineralization of these two deposits occurs within the Archean metamophic rocks of Sanggan Group and Hercynian alkaline complex , respectively. 小营盘金矿产于太古宇桑干群变质岩中，东坪金矿产于海西期碱性杂岩体中。
Conglomerate of the Middle Proterozoic Tietonggou Formation is in unconformity relation with the plagioclase schist of the Archean Taihua Group. 中元古界铁铜沟组砾岩，砾石形态多样，与下面的太古界太华群斜长片岩呈角度不整合接触。
Gold mineralization in the study area is hosted in continental volcanic rocks of Middle Proterozoic, Xionger Group overlying the Archean crystalline basement. 本区金矿化产于太古界结晶基底之上的中元古界熊耳群陆相火山岩中。
The fault dips to north, the downwall of which is the plagioclase schist of the Archean Taihua Group and the upperwall is the Neogene red mudstone and the Quaternary loess. 断层倾向北，下盘为太古界太华群斜长片岩，上盘为新近系红色泥岩和第四系黄土。
Fuxin basin is a continental graben basin of the Mesozoic. Based on the strata of the Archean and the mid-Proterozoic it was filled with two coal-bearing series of rocks during the late Mesozoic,named Shahai Group and Fuxin Group. 阜新盆地是中生代陆相断陷型盆地,由太古界、中元古界组成盆地基底,其上接受了晚中生代地层沉积,包括沙海组、阜新组两套含煤岩系。
Their lead isotopic values are much higher than those of the Archean metamorphic rocks of the Sanggan group in this area, and located between the two lead growth curves of upper mantle and lower crust. 其三组铅同位素比值明显高于本区太古界桑干群变质岩，并位于上地幔和下地壳铅增长线之间。
Such low levels of sulfate indicate that the Archean atmosphere was virtually devoid of oxygen. 如此低的硫酸盐浓度，表示太古代大气中的氧气极为稀薄。
The group of barbaric soldiers killed many people. 那群野蛮的士兵杀了很多人。
At this period, depositional formations have a distinct style from those in the Archean. 中文摘要太古宙向元古宙的转变，宣告地球历史进入了一个新的重要阶段。
The group was made up of doctors. 这个团体是由医生组成的。
Metamorphic and Tectonic Evolution of the Archean Granulite Belt of MT.Daqingshan and Gold Mineralization, Inner Mongolia, Chi II. 内蒙古大青山太古宙麻粒岩带的变质构造演化及金的成矿2。
A group of boys dashed out of the classroom. 一群男孩子从教室里冲出来。
These siliciclastic rocks were derived mainly from the Archean and minor from Paleoproterozoic in the southern margin of the North China craton. 源岩以太古宙地层为主，可能有古元古代地层的加入，经历了中等程度的风化作用，并快速堆积形成的。
I come upon a group of children play in the street. 我遇到一群孩子在街上玩耍。
The wind whirled the dead leaves about. 风吹得枯叶在四处回旋。
The wind was whispering in the trees. 一阵风穿过树林沙沙作响。
There are 26 letters in the English alphabet. 英语字母表中有26个字母。
Foreign nationals were asked to leave the country. 外国侨民被要求离开该国。