难以控制

Image compression based on the second generation Bandelets transform,whose optimized bandeletization is controlled by quantization step,cannot realize fixed bitrate image compression.

由于第二代Bandelets变换是由量化步长来控制最佳Bandelet化过程，难以实现定码率图像压缩。

There are two modeling methods used in this research area, that is analytical method and numerical method. Analytical method can be used to analyze the sound pressure within enclosures, and to analyze the control mechanisms theoretically, however it can be used for regular cuboids only. Numerical modeling method can manage enclosures with arbitrary boundaries, nevertheless, the results obtained using this method are dispersed sound pressure. It is hard to conduct real time control with this method. The two modeling methods have their own inherent defects.

对于封闭空间的结构声辐射，目前有解析建模和数值建模两种建模方法，解析建模方法可以从理论上对系统进行分析，探讨消声机理，但它只适用于长方体等规则封闭空间；数值建模方法不受空间边界形状的限制，得到的是空间声压的离散结果，难以用于实时控制，两种方法都存在着局限性。

Such systems were one of the main characteristics of the Qin and Han empires and the Roman Empire.

从中央对地方的控制程度来看，罗马帝国与秦汉帝国是难以比拟的。

The feedback of К190ПК rail flash welding machine was low, and it's difficult to weld U75V steel alloy rail with continuous flash butt welding process. The software and hardware of control system has been reconstructed to solve these problems.

针对К190ПК钢轨闪光焊机响应速度慢，只具有连续闪光焊工艺，难以实现U75V钢轨的焊接等问题，对焊机控制系统的软、硬件进行了改造。

Serious infections, including drug and incision and drainage, although still can not control, but the spread of the trend, and even threatened the life of patients with acute infection, gas gangrene income, and certain chronic infections, long-term recurrent difficult to cure, causing extensive damage and serious physical deformities, loss of function and even cancer, such as induced.

3严重感染包括虽用药物和切开引流仍不能控制，反而蔓延趋势，甚至威胁病人生命的急性感染，入气性坏疽，以及某些慢性感染，长期反复发作难以根治，引起广泛破坏和肢体严重畸形，功能丧失，甚至诱发癌变等。

The main facets are as followings: The imperfects under socialist market economy system include that the administration system according to administrative region limits the formation of emissions market, modern enterprise system is not perfect and emissions savings business lacks corresponding financial organization; Extensive economic growth has difficulties in controlling the total pollution amount; There are changes in the structure and distribution of pollution sources; The trading confronts higher expenses; Government interferes more and more.

但中国目前正处于一个社会的快速转型时期，因此在中国实施排污权交易制度有着许多特点和困难，主要有以下几个方面：社会主义市场经济体系不完善，包括按行政区域划分的管理体制限制排污权市场的形成、现代企业制度的不完善以及缺乏相应的金融机构开展排污权储存业务；粗放型经济增长难以进行污染总量控制；污染源的结构和分布发生了变化；排污权交易面临更高的交易费用；政府干预过多等等。

In the medium and high power SMPS, phase shifting controlled ZVS PWM full-bridge converter is favour topology. But in this converter, ZVS is difficult to be achieved for the lagging leg at light load.

在中大功率应用中，通常采用于移相控制ZVS PWM DC/DC全桥变换器，该电路在轻载时难以实现滞后桥臂的零电压开通。

To solve the problem of modeling temperature control in the fermentation process , a neural network nonlinear

针对生物发酵过程中温度控制难以建模的问题，基于非线性自回归滑动平均模型，设计了

The river flows north stroppy mainland to some of the most fertile farmland by humans, is now fully controlled properly.

这条难以驾驭的河流流经北美大陆一些最肥沃的农田，现已完全由人类控制得当。

By having each private company assume responsibility for its corner of the Internet, the government effectively outsources the otherwise unmanageable task of monitoring the billions of e-mail messages, news stories and chat postings that circulate every day in China.

让每一件网络公司都各扫门前雪，政府就有效地控制了用其他方法难以监控的数十亿电子邮件，新闻，论坛话题。

With Death guitarist Schuldiner adopting vocal duties, the band made a major impact on the scene.

随着死亡的吉他手Schuldiner接受主唱的职务，乐队在现实中树立了重要的影响。

But he could still end up breakfasting on Swiss-government issue muesli because all six are accused of nicking around 45 million pounds they should have paid to FIFA.

不过他最后仍有可能沦为瑞士政府&议事餐桌&上的一道早餐，因为这所有六个人都被指控把本应支付给国际足联的大约4500万英镑骗了个精光。