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A necessary and sufficient condition about the reducibility of central essential hyperplane arrangements is given:a central essential arrangement is irreducible if and only if the matroid is connected.

具体地，本文将对每一个超平面构形，构造一个拟阵，证明中心本质构形不可约的充分必要条件是对应的拟阵是连通的。

From the Greece and Rome who absorbed fragrance with oil to the rose essential oil which is refined by applying distillation in Arabia and the dense fragrance of palace which was constructed with muskiness and slurry, various fragrant products, fragrant greases, fragrant creams, aromatic essential oils, flavor and perfume, people are enchanted to various fragrance and are willing to obtain them with high cost.

从希腊人和罗马人用油吸收植物的香味到阿拉伯发明了蒸溜法提炼玫瑰精油到用麝香混入泥浆来修建宫殿使宫殿散发出浓烈持久的香味，各种香品、香脂、香膏、香精油、香料、香水出现，人们对各种香越来越着迷，并愿意为之付出很大代价获取。

It is an essential definition because it attempts to get at the essential features of the concept - its necessary and sufficient conditions of application.

它是一个本质定义，因为它试图抓住这个概念的本质特点——即使用这个概念的必要条件和充分条件。

While a nominal amount of essential fatty acids can be obtained from the foods you eat, the majority of the population tends to consume far more of the saturated 'bad' fats than essential 'good' fats (Omega 3 and omega 6). Omega 3-6-9 is an well balanced, full-spectrum source of these three "good fats".

基本脂肪酸能够从我们的正常饮食中获得，大多数人往往是大吃大喝容易造成"坏"的脂肪多与"好"的基本脂肪（Omega 3 和Omega 6），Omega 3-6-9是一种维持健康均衡以及这三种"好的脂肪"的充足来源。

Existence of essential hypertension patients with abnormal glucose metabolism than normal incidence significantly increased,there are signification of measured HbAlc of patients with essential hypertension to prevent and control diabetes.

原发性高血压病患者存在糖代谢异常较正常人发生机率明显增高，测定HbAlc对高血压病患者预防和控制糖尿病的发生有较好意义。

Objective:To observe the therapeutic effect of the comprehensive psychotherapy on essential hypertension Methods:A total of 100 essential hypertension patients were divided into studied group and comparing group,according to their odd or even ordinal numbers during the psychological examination.

目的 ：观察综合性心理治疗原发性高血压的疗效。方法：将 10 0例原发性高血压患者按心理检查时单双序号分为研究组和对照组。研究组在口服常规降压药物治疗的基础上，采用行为干预治疗、生物反馈、放松训练、支持性心理治疗等综合疗法。对照组仅口服常规降压药物治疗。每位患者均于治疗前、治疗后 3个月和 6个月检测临床指标：血压、血脂(TC、TG、HDL- C)、进行治疗前及同期组间比较。

If your "feel" is able of distinguish what is essential and what is not may be that a particulare is essential!

如果你的感觉可以辨别出什么是重要的，什么不重要（有一点特色可能更重要！

DVibrio parahaemolyticus: Each essential oil from the rhizome, stem, leaf and flower, as well as in ether zone and pentane zone, the antibacterial effects of all is 100% by 0.05% density of each essential oil.

4肠炎弧菌：0.05%浓度的月桃根、茎、叶及花等精油及其层析 pentane区分物及ether区分物，即有100%之抗菌效果。

An entire audience level of forests landscapes altogether division is 7 kind of landscapes essential factors,Pine forest, the foliage forest, the bamboo grove and the pinery are this area main forest landscape essential factor type.

全场一级森林景观共划分为7类景观要素，其中杉木林、阔叶林、竹林和松林是该区的主要森林景观要素类型。

Individualism has such essential and non-essential characteristics as plebeianism, freedom, democracy and aggression.

个人主义具有平民性、自由性、民主性、侵略性等本质特征和非本质特征。

In the days of sailing vessels the crew were afraid they would be becalmed on the ocean.

在使用帆船的时代，船员们担心他们会因为无风而无法在海洋上航行。

As long as foreign donors pay the PA's salary bill, few expect a new intifada.

只要外国继续为巴权力机构的薪水买单，希望发动新暴动的人便寥寥无几。