必需的

According to the most unfavorable fire scenario for safety evaeuation, the AEST can be obtained through the spread of fire and smoke spread simulation. And the REST of different staff loads are calculated by empirical formula method. Through contrasting two times, whether evacuation passage setting can meet the evacuation requirements is confirmed, and then solutions are proposed. Then highway tunnel fire cause is discussed by Fault Tree Analysis method, and the effective measures to reduce the probability of tunnel fire are reducing the number of flammable materials and using fire-retardant or noncombustible materials for inner decoration are obtained.

以厦门金山寨隧道为例分析火灾时人员的安全疏散，针对隧道内最不利人员安全疏散的火灾场景进行分析，通过对火灾蔓延、烟气扩散进行模拟获得可用的人员安全疏散时间AEST，并用经验公式法计算不同的人员荷载下必需的人员安全疏散时间REST，对比两个时间，判别当前疏散通道的设置是否满足人员疏散要求，并对不满足安全疏散要求的工况提出解决方案。

He pays no court to the passions; he excites neither surprise nor admiration; he always understands himself, and his readers always understand him: the peruser of Swift wants little previous knowledge; it will be sufficient that he is acquainted with common words and common things; he is neither required to mount elevations nor to explore profundities; his passage is always on a level, along solid ground, without asperities, without obstruction.

他没有支付对强烈的感情法院；他不刺激惊奇也不刺激赞赏；他总是了解他自己，而且他的读者总是了解他：迅速需要一点早先的知识 peruser；它将会充份他熟悉通常的字和通常的事物；他是既非必需的展开海拔也不探究深；没有障碍，没有粗暴，他的通道总是在一个水平上，沿着固体地面。

This research has compared the classic extraction method and the salting out method of spider genome DNA.

昆虫基因组DNA的提取是对昆虫在分子水平上进行研究的关键，提取的DNA的纯度、浓度及结构的完整性是进行基因工程各项研究所必需的条件。

Where the original album suffered from flat sound and an abrupt ending, this has been remastered and remixed to give it the spacy vibe and airy sound it needs.

专辑原先的音色乏味，结尾也过於唐突，经过2002年的重新灌录和混音，为原先的音乐加入了所必需的空阔的颤音以及轻快的音色。

It is the study of the use of spherical coordinates to determine how the objects projected on the celestial sphere depending on the location, and study these changes depending on location laws and causes, offered to time depending on location of celestial calculation of parameters of the basis and method, as all the astronomical observations necessary for the basics, the main means of spherical trigonometry math and matrix operations.

它所研究的是怎样利用球面坐标确定天体投影在天球上的视位置，并研究这些视位置变化的规律和产生原因，提出以时间为参数的计算天体视位置的依据和方法，成为一切天文观测所必需的基础知识，主要的数学手段是球面三角学和矩阵运算。

We should have a sort of respect for rules and principles so universal. Perhaps we should speak of the common ingredient as being of the essence of the transaction into which it entered, and should stigmatise the remaining apparatus of ceremony, which varied in different communities, as adventitious and accidental.

也许我们会认为，这种共同的要素是进行交易所必需的本质，而剩下来的在各个社会中不相同的仪式，则只能被认为是偶然的和非必要的。

Fluorouracil is a kind of popular antimetabolic drug used in clinic. It has the similar structure with Uralic, which is necessary to the cancer cell. It contents with Uralic in the same enzyme system, block the metabolic link, impeds the synthesis of DNA, and then prohibits the propagation of the cancer cells .

5-氟尿嘧啶(5-Fu)是一种在临床上已为人们所熟知的抗瘤谱广，有效率高的抗代谢药物，它的结构与肿瘤细胞代谢所必需的尿嘧啶相类似，在同一系统中互相竞争，阻断代谢环节，阻碍DNA的合成，从而抑制肿瘤细胞的增殖。

As a try of this mode, this paper dilates the evolutive process of a simulantelectrical laboratory. The necessary subjective and objective conditions for the developing of this software, the softwares present developing situation and feasibilityof researching in the future are put forward.

作为对这种新型实验教学模式的一种探索，本文详细介绍了仿真物理实验室电学部分的开发过程，分析了开发这种新型软件所必需的各种主客观条件，软件开发目前已达到的实际水平、将来的发展方向、大规模开发的可行性及其应用前景。

It is inevitable, necessary, and even useful for endowing education development program with more rationality, legitimacy, and validity.

知识冲突在教育发展规划制定过程中的存在不仅是必然的，而且也是必需的。它的存在不仅有利于赋予教育发展规划以更多的合理性与进一步重构教育发展规划的合法性，而且也有利于保障与提高教育发展规划的有效性。

Therefore, the present standard of "public interests" should be reenacted and some basic aspects should be taken into account as follows: the purpose of the application for expropriation shou...

鉴于此 ，有必要对我国的&公共利益&标准予以重新构建，对其重构时，主要以下列几个方面为基点：申请或征用主体的主观目的具有公共性；土地征用行为客观上具有效益性；土地征用所欲实现的利益与公民生存和发展所必需的社会价值相关；土地征用的程序合法性；需赋予司法机关一定的权力，对土地征用目的的公共性进行审查。

Chrysanthemum of 10 thousand birthday is lax to edaphic requirement, with the arenaceous qualitative loam with fecund, good drainage had better.

万寿菊对土壤要求不严，以肥沃。排水良好的砂质壤土为好。

He unstepped the mast and furled the sail and tied it.

他拔下桅杆，把帆卷起，系住。