The oldest rocks in the concession area belong to the Guyana and are of Precambrian age.

They are controlled by shear fracture belt of epimetamorphic rock series of Precambrian Period.

主要赋存于前寒武纪浅变质岩系中,受剪切断裂带控制.

Precambrian time for as much as eighty-five percent of all geological time.

从前寒 武 世纪以来地球地面大部分被冰川所覆盖的任何地质年代.

Objective To research precancerous lesion diagnosis and early prevention and treatment of the cervix carcinoma.

目的探讨子宫颈癌的早期癌前病变,诊断要点及早期防治.

Objective To explore the practical means for identifying early carcinoma and precancerous lesions with magnifying endoscope.

目的探讨如何通过放大内镜观察到的大肠粘膜腺管开口类型发现早期大肠癌及癌前病变.

Active treatment for precancerous lesion of the gastric-remnant.

术后对残胃的癌前状态积极治疗.

Gastric precancerous lesions is the potential benign lesion of gastric carcinoma.

胃癌前期病变是指具有胃粘膜癌变潜在可能性的良性病变.

Objective To investigate the effects of Golden Hamster cheek Pouch precancerous lesion conversion blocked by microwave.

目的观察微波治疗在阻断金地鼠颊囊癌前病变恶化中的作用.

Both vaccines also appeared to prevent abnormal, precancerous cell growths found in the cervix, he says.

他说,两种疫苗还可预防子宫颈不正常的癌前细胞的增长.

Objectives To study the changes of precancerous lesions of stomach and their relationship with gastric cancer.

目的探讨胃癌前病变的转归以及与胃癌的关系.

He balanced precariously on the narrow window-ledge.

他在狭窄的窗台上很难保持平衡.

A bracelet was precariously placed on the rim of a well.

他把一篮鸡蛋很不安全地顶在头上.

Many of them orbit precariously close to their parent stars, so they scorching hot.

其中许多行星的轨道距其主恒星极近, 因此这些行星是炽热的.

She had grown so luminous even Dorothy, perched on her barrel, was precariously spellbound.

她变得那么容光焕发, 使得站在木桶上的多萝茜给危险地迷住了.

They live precariously on the income from a few small investment.

他们依靠些微投资中的收入,过著朝不保夕的生活.

The precariousness is further increased by self-experiences in the aforementioned marginal situation.

在上述边际情况下自身经验会更进一步增加这种不确定感.

Combined with the construction, the paper introduced the design and application of precast beam inner form.

根据在太祁高速公路晋祠高架桥箱梁预制中的施工情况, 介绍了预制箱梁的内模设计与应用.

Precast girder segment is widely used in the construction of Hong Kong West Railway.

预制梁节在香港西铁的建设中被广泛采用,具有很好的推广前景.

Segments may be precast long enough to reach sufficient strength and maturity.

块件可以在很早就进行预制,以便使块件混凝土达到足够的强度和龄期.

It was made of a large precast concrete panel.

这是由一大型混凝土预制板制成的.

Under the engineering geology conditions in Wuhan, the superiority of precast pile is discussed.

针对武汉地区工程地质条件, 论述了预制桩推广应用的优越性.