四个

Such a short span of 10 characters of the four hidden danger: from Ignorance of managers to run businesses, like "blind man on horseback", which is the first danger; rely on the ignorance of the staff, just as "riding a blind horse," This is the second risk involved in the fierce market competition, just as "The deep pool," This is the third risk in the global economic downturn when participating in the fierce market competition, just as "Midnight A deep pool," and this is the fourth dangerous.

这短短十个字隐藏了四个危险：由无知的经理人来经营企业，就如同"盲人骑马"，这是第一个危险；依赖无知的员工，就如同"骑瞎马"，这是第二个危险；参与激烈的市场竞争，就如同"临深池"，这是第三个危险；在全球经济不景气的时候参与激烈的市场竞争，就如同"夜半临深池"，这是第四个危险。

This study shows that there are 4 kinds of volcanic facies in deep volcanics in north Songliao Basin: eruptive facies, overflow facies, volcanic vent facies and volcanic sedimentary facies. There are 4 volcanic eruption cycles: Huoshiling period, Shahezi period, Yingchengzi period and Quantou period. There are 4 structural evolution stages: north-south accumulation, west-east subduction, uplift mantle and thin crust, alternative open and close. There are 4 kinds of pool-forming patterns:(1) pattern with the migration along the unconformity and fault to the near crater;(2) pattern with the migration along unconformity and fault to the rift margin;(3) pattern with the migration along unconformity, fault and fracture to the source rock;(4) pattern with the migration of the deep gas along the deep and large fault to the volcanic trap.

研究认为，松辽盆地北部深层火山岩主要存在四种火山岩相：即爆发相、溢流相、火山通道相、火山沉积相，划分为四个火山喷发旋回：即火石岭期、沙河子期、营城子期、泉头期，经历了四个构造演化过程：即南北夹攻、东西俯冲、幔隆壳薄、开合交替，具有四种成藏模式：即沿不整合面和断层运移至近火山口处火山岩圈闭聚集成藏模式、沿不整合面和断层砂岩疏导层运移至断陷边部火山岩圈闭聚集成藏模式、沿不整合面及断层、裂缝运移至源岩区内凹中隆火山岩圈闭聚集成藏模式、深部无机成因天然气沿深大断裂运移至火山岩圈闭聚集成藏模式。

Two of the four alcohol oxygen atoms O3 in theligands act as oneμ2 bridged atom and the other two O6 act asμ3 bridge to link to Cuatoms together, resulting in the tetranuclear structure.

而立方烷型四核铜骨架配合物是分子中四个Schiff碱配体各提供一个亚氨基N、一个酚基O和一个醇羟基O，与四个Cu一起形成立方烷型四核铜骨架。

Volume 1 introduces the history of accordion , Volume 2 is about the preliminary spread of accordion in China . I dug into great amount of concerning historical data of four aspects, they are the early accordion textbooks, the accordion activities happened in Shanghai, Haerbin and Yanan, which veritably resurges the development of accordion art in China before 1949. Volume 3 reveals the development of Chinese accordion art from after 1949, I focused on five aspects, namely the production, education, performance, theoretical study and communication between China and foreign counties, in time order. This part comprehensively shows the plenty fruits of accordion art in around 50 years after the foundation of China. Volume 4 mainly concerns the development of Chinese accordion music composing. It reviews the history in four periods. Meanwhile, this part also analyses in detail the nationalization pursuit and the utilization of performance skills in composing.

第一章是对&手风琴历史源流&的介绍；第二章是&中国最初的手风琴艺术传播&，本人挖掘出大量的相关史料，从&早期的中国手风琴教科书、上海、哈尔滨和延安的手风琴活动&四个方面进行了研究，真实地再现了1949年以前的中国手风琴艺术发展；第三章是&新中国成立以来的手风琴艺术发展&，分别从&乐器制造、手风琴教育、表演、理论研究与中外交流&五个方面按时间顺序进行了论述，全面反映了手风琴艺术在新中国成立后50余年所取得的丰硕成果；第四章是&中国手风琴音乐创作的发展&，论文将手风琴音乐创作分为四个时期进行了历史的回顾，并对创作中的民族化追求以及手风琴演奏技巧在创作中的运用作了具体分析。

The four clutches are used to distribute the driving force generated by the electric motor and combustion engine via four fixed ratios and two electric variable ratios to all four wheels on the 4MATIC permanent all-wheel-drive system, depending on the driving situation.

四离合器用于分发的驱动力所产生的电电动机和内燃机通过四个固定比率和两个电动可变比率所有四个车轮上的4MATIC永久全轮驱动系统，根据驾驶状况。

The four experimental virus strains and the three collate virus strains were divided into two groups, and belonged two evolutionary branches. Although ADV-DL1, DL2 and DL3 were all belonged to the Da Lian separated strains, they had the ulterior genetic relationship. The nuclear sequences of the obtained experimental ADV virus strains, ADV virus collate virus strains and typify virus strains of other four Parvovirus generic were cladogram analyzed with the Clustal W method of software DNA Star.

结果表明，ADV-Utah与四个实验毒株的序列同源性较高，同源率为92.9-93.4％，ADV-G、ADV-SL3与实验毒株的同源性较低；四个实验毒株和三个参考毒株被分别划归为两个组，分属于两个进化分支；实验毒株中ADV-DL1与DL2和DL3虽然同为大连分离株，却表现出较远的亲缘关系。

Determination of Tyrosine in Urine Spectrophotometric Method;2. For chemical pre-extraction, MSTFA/TMSL derivatization reaction, GC/MS analysis, it is confirmed that two main metabolites (19-no-randrosterone and 19-noretiocholanolone) were found in nandrolone urine.

本文对合成的19-去甲雄烷醇酮的四个差向异构体混合物进行气相色谱分离，对诺龙和炔诺酮用药后，留取的人尿样通过化学预处理，MSTFA/TMSI衍生化反应，GC/MS分析，确证了尿样中诺龙的两个主要代谢产物为19-去甲雄酮和19-去甲原胆烷醇酮，炔诺酮的两个主要代谢物是四氢炔诺酮的两个形式，可能是3α-OH-5α-THINE和3α-OH-5β-THINE，在炔诺酮代谢前期，还发现有诺龙的上述两个代谢物存在。

The core of test theory for a new generation of test is the combination of psychometrics and cognitive psychology, which is the key idea of the article .The article supposes there are four factors underlying response difficulty of Raven's Standard Progressive Matrices: figure complexity, figure format, transformation dimension, location factor. The hypothesis is tested by linear logistic latent trait model and proved to be valid.

本文在以认知和测量相结合为核心的新一代测验理论的指导下，从瑞文标准推理测验项目刺激特征的角度，对项目认知难度的影响因素进行了认知分析，提取出四个因素：图块繁简度、图块布局、变化维度、题序因子，结合线性逻辑斯谛克潜在特质模型对这四个因素进行了检验，证明提取出的四个因素是有效的。

Other eight wheels set in pair, which is urged by four frequency conversion motors through the transmission of the lazy wheel.

设计的轨道载重行走机有十二个车轮，其中前后四个仅起支承作用，另有八个车轮两个为一组，通过惰轮的传动，由四个变频电动机驱动。

While this boundary does not mark the outer limit of a State's territory, since in international law the territorial sea forms part of a State's territory, it does represent the demarcation between that maritime areawhere other States enjoy no general rights, and those maritime areas（the territorial sea and other zones）where other States do enjoy certain general rights.

句子解析：在这个句子中有四个从句，第一个是由while引导的让步状语从句；第二个是由since引导的表示原因的状语从句，并且它是属于由while引导的让步状语从句的，即它是其从句；第三个和第四个都是由where引导的定语从句并且用法也都是一样的，都是对不同的maritime area的进一步说明解释。

Cynanchum Lingtai apricot production in the average weight 65 grams, the brightly-colored fruit, juicy rich, sweet-sour taste, sweet from the nucleolus, when the late Qing Dynasty famous Shaanxi, Gansu provinces, the Qing imperial court Tongzhi tribute for years.

灵台生产的牛心杏平均单果重65克，果实色泽鲜艳，汁多味浓，甜酸适口，离核仁甜，清末时就驰名陕、甘两省，清同治年间曾为朝廷贡品。

Chenopodium album,Solanum nigrum, and Amaranthus retroflexus were very susceptible to the herbicides. Polygonum persicaria and Abutilon theophrasti were relatively less susceptible to the herbicides, and Lycopersicon esculentum was not susceptible to it. The relationship between reduction rates of weed biomass and PPM values of weed leaves 2,4, and 6 days after treatment was established.

供试的6种杂草对该混剂的敏感性存在显著差异：红心藜Chenopodium album、龙葵Solanum nigrum和反枝苋Amaranthus retroflexus对该混剂最敏感，ED90值分别为47.65、71.67和29.17g/hm2；春蓼Polygonum persicaria和苘麻Abutilon theophrasti敏感，ED90值分别为96.91、114.20g/hm2；而番茄不敏感。