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After a brief review about the problems of bit rate control for MPEG video coding, two optimizations are proposed based on MPEG-2 Test Model 5 (TM5) algorithm:①An intelligent integral action is introduced for improving the control precision of bit rate;②After using DCT AC coefficients to define the measure of macroblock and picture coding difficulty, an improvement on target bits allocation is proposed for the decoded picture quality and conformance including scene change, which can ajust the target bits allocation adaptively by their measure.

文中首先对MPEG视频编码比特速率的控制问题作了简要回顾，然后针对MPEG-2测试模型5(TM5)算法进行了以下优化：①引入一种智能积分作用，有利于提高比特速率的控制精度；②采用DCT交流系数定义宏块和图象的编码难度测度，然后提出了优化的目标编码量分配策略，即根据编码难度测度自适应调整图象和宏块的目标编码量，这样有利于提高包括场景变化在内的图象解码质量及其一致性。

I am acutely aware of the difficulty we face.

我敏锐地预料到我们所面临的困难。

To solve the difficulty in modeling a chemical system a new node granularity transformation method based on object directed acyclic graph was proposed.

针对化工系统模型难以确定的问题，提出了基于对象的有向无环图节点粒度的转换方法。

Passagework and all kinds of melismas were of no difficulty to him. In the invention of free ornamentation in adagio he was very fertile.

过门与各种音串唱法对他都不是难事，他在自由装饰音的创意中的慢板是非常的丰富。

The stability of acidified fruit milk affected by the factors such as material quality, the milk content, the system acidity, additive categories, the process and parameters of machining and so on, it is a difficulty problem in new dairy products development.

酸性果乳的稳定性受到原料质量、牛乳含量、体系酸度、添加剂种类和用量以及加工工序和参数等诸多因素的影响，一直是新型乳制品开发中的难题，而要提高产品的稳定性，关键问题还需解决牛乳酪蛋白在酸性条件下的稳定性。

Want to say difficulty meets what some blame quite to displease the person's opportunity namely, the likelihood is the enterprise is done in this industry big have this case, this is aeriform pressure, not important to me.

要说困难就是会有些怪怪的得罪人的机会，可能是企业在这个行业做大了就有这个情况，这都是无形的压力，对我来说不重要。

A finite element model is proposed to calculate the mechanical state of a moored aerostat system. The difficulty in matching the loads of the tethers is overcome by releasing the tether constraints and applying the load step by step. The causes of non-convergence during computation is investigated and solved by modifying the criterion appropriately.

针对浮空器地面系留系统采用多级系绳集束设计导致有限元建模中系留力难以施加的问题，提出了分步加载，对系绳节点逐级建立载荷匹配关系的建模技术；对囊体局部应力集中导致计算难以收敛的问题进行了分析并提出解决方法。

Although the implementation of a certain degree of difficulty, but after the completion of the effect will be very unique.

虽然实施了一定程度的困难，但完成后的效果将是非常独特的。

It is the real difficulty to assess the aftereffect of supply chain risk caused by uncertain contingent events.

不确定偶发风险事件导致的供应链风险后果的估计是风险估计的难点所在。

There's two levels of difficulty and you can compete against others or race against the clock.

有两个层面的困难，你能与别人或分秒必争。

Chimborazo and Cotopaxi, took me by the hand.

越过琴博腊索山和科托帕克西山。

This car is in a good condition.

这辆车的状况很好。