难以

International trade is full of risks with changeful surroundings; its executing period is long and difficult to control.

国际贸易具有高风险、周期漫长、情况变化莫测、成交环节众多的特点，因而难以操作。

With the development and progress of the society, autonomous learning and characteristic learning become more and more important in the instructional mode of adult education, and the paper-and-pen exam comes to expose its disadvantage like unilateralism and changelessness. We find out in instructional practice that the paper-and-pencil tests usually hard to fit the cognition of adult learner, so it is hard to evaluate accurately and efficiently.

在实际教学中我们发现，传统的笔试方式往往很难适应成人学生的认知特点和认知规律，从而难以保证考试结果作为课程教学效果测评的准确性和有效性；并且，传统笔试形式极大忽略了考试的诊断反馈功能，忽略了考试结果所体现出的教学过程中出现的问题或是教师很难从考试结果中发现问题，因此不能有针对性地改进教学。

Location of tap changer is not accessible and it is difficult to operate.

地点的分接开关，是不容易，这是难以运作。

You know, Chappy's too small to handle all this snow.

你们看，恰皮太弱小了它恐怕难以应付这一地的积雪

But these products were mostly come to develop by the traditional mode of single task, it is not only difficult with the real-time chara...

但这些产品大都基于传统的单任务模式来开发的，不仅难以保证系统的实时性和可靠性，而且对于复杂应用来说开发效率较低。

By analyzing the form and growth characteristic of the soybean root, this paper discusses the virtual modeling method on the soybean root based on L-system and implements the algorithm using Visual C++.

传统的大豆研究方法具有试验周期长和环境因素难以控制等缺点，而利用计算机技术建立

Financial time series have the characteristic of fat tail and violation assembly,so it is difficult to measure the VaRaccurately by conventional methods.

金融时间序列具有分布的厚尾性、波动的集聚性等特征，传统的方法难以准确的度量其风险。

By mechanical test of the steel strip and simulation of strip deformation in tension leveling using finite element method,characteristic features of the strip were obtained,such as;high yield stress,high yield ratio and low plastic elongation as the basic reason of difficulty in tension leveling and shape control.

通过对全硬钢的力学性能的测定和拉矫变形行为的有限元仿真，发现屈服应力大、屈强比高以及断裂时塑性延伸小等特性是造成镀锌后全硬带钢拉矫困难和板形难以控制的根本原因。

The regional climate model simulates the geographical distribution of surface temperature and characteristic of seasonal variations in China better.

这些气候特点难以用粗分辨率的GCMs细致刻画，因此区域气候模式在中国具有十分广阔的应用价值和研究前景。

Well and layer selection in refracturing requires integrative consideration of multiple influencing factors such as geologic characteristics, reservoir characteristics, characteristical parameters, testing and production data, etc.

重复压裂选井选层需要综合考虑地质特征、油气藏特性、物性参数、测试和生产数据等多种影响因素，难以用传统的数学方法来描述这些参数间的高度非线性映射关系。

However, as the name（read－only memory）implies, CD disks cannot be written onorchanged in any way.

然而，正如其名字所指出的那样，CD盘不能写，也不能用任何方式改变其内容。

Galvanizes steel pallet is mainly export which suits standard packing of European Union, the North America. galvanizes steel pallet is suitable to heavy rack. Pallet surface can design plate type, corrugated and the gap form, satisfies the different requirements.

镀锌钢托盘多用于出口，替代木托盘，免薰蒸，符合欧盟、北美各国对出口货物包装材料的法令要求；喷涂钢托盘适用于重载上货架之用，托盘表面根据需要制作成平板状、波纹状及间隔形式，满足不同的使用要求。