难控制的

Because of the non-linearity, time- variability, multi-parameter, intense coupling of the heating process and especially, the random interfere and anfractuosity of process, precision mathematics model is difficult to be established. The routine PID algorithm can not meet the requirement of control.

高岭土回转窑的加热过程中存在非线性、时变性、多参数强烈耦合这些问题，且随机干扰以及过程机理错综复杂，难以建立被控对象的精确数学模型，采用常规的PID算法很难达到控制要求。

It is a complex optimization system to elevator group control system with multi-objective,stochastic and nonlinear characteristics.

电梯群控系统是一个复杂的决策系统，具有多目标性、随机性和非线性等特点，难以采用精确的数学模型加以描述，因而传统的控制方法很难提高系统性能。

Attention is drawn to the use of aluminium wire because of the difficulties associated with controlling critical creepage and clearance disatance with application of anti-oxidant materials.

铝导线的应用之所以能吸引人们的注意是因为它很难与控制关键性漏电和清除抗氧化剂应用的间隙相联系。

Online control of the complete combustion process allows the exact quantitative analysis of samples hard to combust.

完全燃烧过程的在线控制，可以对难燃烧样品的精确的定量分析。

The existence of indissolvable interlayers leads to many adverse effects for building salt cavern storages by solution mining. It is an urgent technical problem that how to forecast and control the collapse of indissolvable interlayers.

盐岩矿床中难溶泥质夹层的存在给地下储库水溶造腔带来了诸多不利影响，如何有效地预测与控制水溶造腔过程中泥质夹层的垮塌成为亟待解决的技术难题。

In order to satisfy the requirement of Laser Rapid Manufacturing, a new 3D coaxial feeding head was designed.

为了难满足激光快速制造的要求，综合机械设计的相关理论和计算机数字控制技术，设计并试制了三维同轴送粉工作头。

In order to satisfy the requirement of Laser Rapid Manufacturing, a new 3D coaxial feeding head was designed. We control two stepping motors fixed on the 3D feeding head with the system which is made up of microprocessor units.

为了难满足激光快速制造的要求，综合机械设计的相关理论和计算机数字控制技术，设计并试制了三维同轴送粉工作头。

It is difficult to precisely define smuggling, because smugglers constantly adapt their activities to get around new regulations and customs controls.

很难精确地定义走私，因为走私者经常改变他们的行为以适应新的规定和关税控制。

A: hmm its really hard to concentrate on pulling them all the way home, since you need to make big moves moving one ghoul or so, when u need the time to raise skellies use spells use scrolls target units, just to much to care if one ghoul die

真的很难将他们拉回家，你要控制队形的移动，召唤骷髅，用技能，瞄准单位，死一只狗不会怎样的

The widely used rubber bushings can't provide large damping for suppressing excitations from road and /or wheel unbalance.

常见的橡胶衬套很难提供在低频振动控制时所需要的大阻尼。

Cynanchum Lingtai apricot production in the average weight 65 grams, the brightly-colored fruit, juicy rich, sweet-sour taste, sweet from the nucleolus, when the late Qing Dynasty famous Shaanxi, Gansu provinces, the Qing imperial court Tongzhi tribute for years.

灵台生产的牛心杏平均单果重65克，果实色泽鲜艳，汁多味浓，甜酸适口，离核仁甜，清末时就驰名陕、甘两省，清同治年间曾为朝廷贡品。

Chenopodium album,Solanum nigrum, and Amaranthus retroflexus were very susceptible to the herbicides. Polygonum persicaria and Abutilon theophrasti were relatively less susceptible to the herbicides, and Lycopersicon esculentum was not susceptible to it. The relationship between reduction rates of weed biomass and PPM values of weed leaves 2,4, and 6 days after treatment was established.

供试的6种杂草对该混剂的敏感性存在显著差异：红心藜Chenopodium album、龙葵Solanum nigrum和反枝苋Amaranthus retroflexus对该混剂最敏感，ED90值分别为47.65、71.67和29.17g/hm2；春蓼Polygonum persicaria和苘麻Abutilon theophrasti敏感，ED90值分别为96.91、114.20g/hm2；而番茄不敏感。