The associated problems with this weed include its competitiveness, difficulty of control, and the reduction of quality through genetic contamination of pure lines of rapeseed and the like.
与自生油菜(杂草)相关的问题包括杂草的竞争性、难以控制以及通过对油菜纯系的基因混杂造成油菜品质的下降等等。
The difficulty for marketers is creating the right kind of buzz and learning to control it.
难的是那些销售人员要建立正确的商业推销手段，并且学会控制这种商业手段。
However, efforts to control them are consistently undermined by the difficulty and expense of identifying mosquitoes-of which there are at least 3,500 species, many of them hard to tell apart.
然而，控制这些蚊虫的努力一直没有进展，关键在于鉴别蚊虫的难度和费用——至少有3,500种不同蚊虫，其中有不少很难加以区别。
However, efforts to control them are consistently undermined by the difficulty and expense of identifying mosquitoes-of which there are at least 3, 500 species, many of them hard to tell apart.
然而，控制这些蚊虫的努力一直没有进展，关键在于鉴别蚊虫的难度和费用——至少有3,500种不同蚊虫，其中有不少很难加以区别。
The same difficulty faces investors who control their positions on the basis of daily market volumes.
那些以当日交易量为指标控制自己头寸的投资者也面临同样的问题。
The algorithm realizes the pole placement of closed loop systems and overcomes the difficulty of the weighting polynomials choice of the quadratic cost function in general adaptive control.
算法的一个特点是能够配置闭环极点，克服了一般自适应控制二次型性能指标中加权阵选择的困难。
It is a new way to use control configuration software to develop simulation-training system. It can reduce the difficulty of development and increase the speed and quality greatly.
利用瘦客户端的工控软件来开发仿真培训系统，可以大大降低开发的难度和提高开发速度和开发质量。
Using preset or custom characters, set up worlds in which you control the plot, action, and difficulty of the game.
使用预设或自定义字符，成立了世界在你控制的阴谋，动作和难度的游戏。
The difficulty for analysing basin sedimentation is how to control the horizontal variation of continental strata.
如何控制陆相地层横向不稳定性，是盆地分析的难点。
The key and difficulty of the technique is to control the fused drop's deformation accurately, because it influenced the part forming and precision directly.
熔滴变形情况直接影响零件的成形以及成形精度，所以对熔滴的形态变化进行精确控制是该工艺的关键和难点。
Second, we use Binomial Distribution Function to accomplish the control of difficulty proportion in Adaptive Item Bank System.
第三，采用二项分布函数完成自适应题库系统中难度比例的控制。
For the complexity and difficulty of establishing an accurate mathematical model of DO parameter control in sewage treatment system, we propose a fuzzy control method with PLC to deal with it.
针对污水处理系统DO参数控制的复杂性和难以建立准确数学模型的特点，提出了一种用PLC对系统进行模糊控制的方法及实现。
Fast and stable swinging up at the situation of a shot track is the difficulty of swing-up control.
在倒立摆小车轨道较短的条件下实现倒立摆快速稳定的摆起，是摆起控制的难点。
It is difficulty to design control schemes to ensure the stability of hybrid systems with random switched time because of the complexity of hybrid systems.
由于混合系统的复杂性，设计出能保证混合系统在任意切换时间下都能稳定的控制是比较困难的。
In the implementation of highway projects, there are many uncertainty factors resulting in greater difficulty in cost control.
公路工程实施过程中存在着许多不确定性因素，使其造价控制难度加大。
The paper brings forwards the adjusting speed technology to solve the problem of power big and disturb of motor and precision control difficulty.
轧机的电机功率大，干扰严重，其调速精度难以控制，文章提出的数字控制调速技术先进、可靠，解决了上述问题。
In system design, firing system of kiln is a multi-variant coupling non-linear system, which is the difficulty of system control.
在系统设计中，窑炉烧成系统作为一个多变量耦合的非线性系统，是控制的难点。
A very severe nonlinear is presented because flight parameters vary along with the flight condition in the flight of missile which brings much difficulty to the design of control system.
导弹在飞行过程中，其飞行参数随着飞行条件的变化而发生较大变化，呈现严重的非线性，给控制系统的设计带来较大困难。
The engineering design, geology design, main technique difficulty, operation general situation, well track measurement and control technique of the well are introduced.
介绍了该井工程设计、地质设计、主要技术难点、施工概况、井眼轨迹测量及控制技术等。
The sensorless of induction motor field-oriented control employing stator voltages and currents has difficulty in estimating rotor flux in the low-speed range.
在低速范围内，对无传感器感应电动机进行矢量控制时用定子电压和电流推算转子磁通是比较困难的。
Internet technology brings about the changes of the control environment, system structure and the perfection of internal control, meanwhile it also increases the difficulty of safety control.
网络技术和经济促进了企业控制环境的变革、会计系统体系结构重组及企业内部控制程序的完善，同时也增加了安全控制的难度。
Some of the modern random control theories are used to reduce the difficulty of mathematical handling.
同时运用现代随机控制理论，简化了数学处理上的难度。
There are usually three main features about the pilot plant test sample:large mass and large grain size of samples, difficulty to control the sample grade.
半工业选矿试样一般有三大特点：质量大、矿岩石样粒度大及控制送样品位难度大。
Deformation control of the wall is of great importance and difficulty for quality control of large-volume oil tank.
壁板的变形控制是大型油罐质量控制的重点和难点。
The data communication and automatic monitoring are realized, the difficulty of the aeration control is decreased, and the management level of sewage treatment is improved by the designed system.
本设计实现了污水处理系统的数据通讯和自动监控，降低了曝气过程控制的难度，提高了污水处理的技术管理水平。
To control the crimes of "robbery, grab and theft", we should decrease criminal chances, improve the difficulty of crime, increase the cost of crime and lessen the criminal anticipation avails.
采取减少犯罪机会、加大犯罪难度、增加犯罪成本及降低犯罪预期回报等措施，可以有效控制“两抢一盗”犯罪。
The outage of fault branches can cause the system to lose static load flow solutions, which increases the difficulty of analysis and control.
失稳故障支路退出运行使得故障后系统失去静态可行潮流解，增加了分析与控制的难度。
In order to overcome the difficulty of the discretization and application of fractional order controllers (FOC), the digital realization and control characteristic of FOC are studied in this paper.
针对分数阶控制器数值计算和应用难的问题，研究了分数阶控制器的数字实现方法和控制特性。
With the mining depth of the strip mine and the height of the slopes increasing, difficulty of maintaining the stability and control of the slopes becomes bigger.
随着露天矿开采深度的不断增加，矿山边坡高度也不断增加，随之而来的是对边坡稳定的维护与控制的难度大大增加。
With the mining depth of the strip mine and the height of the slopes increasing, difficulty of maintaining the stability and control of the slopes becomes bigger.
随着露天矿开采深度的不断增加，矿山边坡高度也不断增加，随之而来的是对边坡稳定的维护与控制的难度大大增加。
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