使必需

If a similar change should befall the nations of Europe, it will not be in exactly the same shape: the despotism of custom with which these nations are threatened is not precisely stationariness.

在前文所引罕波尔特的一段文字中，他指出了两个东西，因其为要使人们彼此相异所必需，所以也就是人类发展所必要的条件，那就是：自由和境地的多样化。

In order to make data synchronization efficient, some method of change tracking is required.

为了使数据同步有效，某种修改跟踪的方法是必需的。

A ternary operation; a treble row of red beads; overcrowding made triple sessions necessary; triple time has three beats per measure; triplex windows.

三重操作；三排红色的珠子；要容纳过多的人使三次会议成为必需的；三拍子的每一小节有三折；三重窗户。

This paper, which focused on the structure optimization theory and method, has finished such studies as follows: The three dimension model has been built, which provide the necessary conditions for the building of the dynamics equivalent model. By the launch dynamics simulation, the loads of the key joints when the rocket is launched has been got, which provide the necessary data for the finite element analysis and the structure optimization. The finite element model of the excess weight parts of the rocket has been built, buy the finite element intension analysis of the model in two conditions, the displacement and the stress of the key points have been got, which make us know the distributing of the stress and the transmogrification of the part. To satisfy the intension and the precision design request and to decrease the weight of the part as many as possible, the part has been topology optimized by the structure optimization theory and method. After that, the new model has been analysis in structure and launch dynamics. The contrast of the character change of the old part and the new part and the influence on the rocket system have been studied.

本文以结构优化理论和方法为核心，主要做了以下工作：建立了某自行火箭炮全炮三维实体模型，为建立该火箭炮系统的动力学等效模型提供了必要条件，进行了发射动力学仿真，得到该火箭炮发射装置各关键连接部位在发射状态下的载荷，为有限元分析和结构优化提供了必需的数据；建立了该火箭炮发射装置超重部分的有限元模型，分两种工况，对模型进行了有限元强度分析，得出了关键部位的位移和应力值，对其的应力和变形分布有了具体的了解；运用结构优化的理论和方法，对该火箭炮发射装置超重部分进行了拓扑优化，使其在满足强度和精度的要求下尽可能多地减轻重量，对优化后得到的模型进行了结构分析和发射动力学分析，对比了该部件优化前后的特性变化以及对火箭炮系统的影响。

However, today's consistent and unrelenting cost increases have made it difficult to justify the necessary investment.

然而成本的不断增加使调整必需的投资有了一定的困难。

Complete and articulated fossils such as these suggest that the lakes present at that time were fairly deep, to allow the anoxic conditions required for preservation.

象这些完整的和有关节的化石使我们了解到那个时候的湖泊很深，能有这样的保存缺氧条件是必需的。

Recently,the control of power supply of high frequency switch has been developed towards the "high refined and cuspidate" direction.Although the parts of apparatus have small volume and refined precision,the Electro Magnetic Interference and radiation are much stronger than before.

现在的高频开关电源控制已向&高、精、尖&方向发展，这些器件体积小、精度高，但电源内部的电磁干扰、辐射比原来更强了，为了使高频开关电源在预期的电磁环境下能正常工作、无性能降低及故障，并对电磁环境中的任何事物不构成电磁干扰，必需对其进行电磁兼容。

What all manifestations of economism have as a fundamental characteristic is tailing the masses, instead of acting as a vanguard to lead the masses—learning from them, yes, but leading while learning—raising their sights to the possibility and necessity of revolution and working and struggling with them to win them to take up the revolutionary and communist standpoint and fight for its emancipating goals.

经济主义的基本特征表现为&跟随民众&，而不是争做先锋以便领导他们——向民众学习，但在学习中加以领导，使他们的眼光得到提高进而认识到革命的可能性和必需性，与他们一起工作、抗争，争取他们信仰革命和坚持共产主义立场，为实现无产阶级解放目标而斗争。

The existence of social conflictions makes lawsuits indispensable to modern jural society.

社会冲突的存在，使诉讼为现代法制社会所必需。

I ought to comfort myself with the outstandingness and splendor of my rivals, whose work will rob my own of recognition.

例句中英对译：我对手的作品是如此出色，我必需以此聊以自慰，哪怕她们的作品很有估计会使我丧失信心。

Since historical times,England ,where the early inhabitants were Celts, has been conquered three times .

从有历史以来，英国，在此地早期居住的是凯尔特人，已经被征服了三次。

Bluetooth OBEX File Transfer Enables the sending and receiving of files on your phone via Bluetooth.

蓝牙OBEX文件移动允许经过蓝牙传送和接受文件。。。。