前言

Colorectal cancer is one of the most common malignant tumor whose morbility keeps rising .the mortality of colorectal cancer is about the forth to fifth among all the malignant tumor.

前言 大肠癌是一种常见的恶性肿瘤，是威胁人类健康和生命的最主要疾病之一，其发生率在世界发达国家占全部恶性肿瘤的第2-3位，在我国占第4-5位。

The corrosion and erosion-corrosion behaviors of A3 carbon steel in naphthenic acid mediums at high temperature were studied in detail.

1前言高温环烷酸腐蚀和冲刷腐蚀是世界炼油工业的宿敌，也是目前炼油厂亟待解决的难点问题之一。

The adsorption of PAM and HPAM (partially hydro- lyzed polyacrylamide) on bentonite and kaolinite surfaces at 30℃ has been investigated,using a nephelometric technique for the direct determination of PAM and HPAM in dilute solution.

一、前言 PAM和HPAM作为优质絮凝剂，已被石油、地质、环保、矿业等部门广泛接受l'一艺。

Abstraction Introduction Rheumatoid arthritis is a chronic polyarticular inflammatory disease that is usually characterized by symmetrical synovitis in which hyperplasia of synovial lining cells and pannus formation are presented.

前言 类风湿关节炎(rheumatoid arthritis，RA)是一种常见的以关节组织慢性炎症性病变为主要表现的全身性疾病。

Mica was chosen as a fiber mineral in replacement of asbestos with poryphyllite, calcite and periclase as filling materials to synthesize mica composite material slab.

前言石棉是人类利用最早、应用最广泛的矿物材料，具有很多其他纤维不可取代的优越性，但它也像某些材料一样会对人体造成一定程度的危害。

The compressed encoding of image data is one of the most important ring - joint of digital photogrammetric surveying field.

前言 图像数据压缩作为数字摄影测量领域的关键环节，一直受到测绘专业人员的高度关注。

Introduction Acne is a very common skin disease of adolescence characterized by an inflammation of pilosebaceous follicles.They usually localizes on the face,more often cheeks and forehead,on the chest and back.

前言 痤疮是皮肤科的一种常见疾病，好发于青春期，是毛囊皮脂腺的慢性炎症，常发生于面颊、额部、胸部、背部。

Abstraction Introduction Rheumatoid arthritis is a chronic polyarticular inflammatory disease that is usually characterized by symmet...

前言 类风湿关节炎(rheumatoid arthritis，RA)是一种常见的以关节组织慢性炎症性病变为主要表现的全身性疾病。

At last ,this thesis discuss some prefatorial problems of symmetry in the world of physics.

最后，对对称性在物理世界中的一些前言问题做简要论述。

The grammar is still not up to the standard of a publishable paper.

是50，但在前言里提到的是小于50，请保持一致。

Do you know, i need you to come back

你知道吗，我需要你回来

Yang yinshu、Wang xiangsheng、Li decang,The first discovery of haemaphysalis conicinna.

1〕 杨银书，王祥生，李德昌。安徽省首次发现嗜群血蜱。