Especially when the time path is a highly non-linear, the polynomial rules become very complex and difficult to operate.
特别是当时间路径为高度非线性时，多项式法则变得很复杂且很难操作。
In the process of the introduction of classical problem based learning, the combination of PBL teaching method and current teaching method was found to be abstract and difficult to operate.
将国外经典PBL教学模式引入临床教学过程中，发现经典PBL教学模式与目前教学模式结合起来时存在抽象、操控难度大等问题。
Because it is difficult to trace hackers, exactly who isbehind any specific attack and how and where they operate remains to alarge extent a mystery, technology experts say.
技术专家说，因为黑客很难追踪，所以谁是攻击的幕后黑手很难确定，他们在哪里以及如何发动的攻击在很大程度上也都是谜。
But both companies are still years away from planting enough trees to operate sustainably; and a recent crackdown on illegal logging in Indonesia promises to make their business even more difficult.
但这两个公司要想实现稳定的纤维供应还需要几年的时间种植足够砍伐的树木，但随着最近针对非法砍伐树木行为打击力度的增加，又使这两个公司的生意如履薄冰。
As our relationship with Pakistan becomes more and more difficult, for the United States, this supply route is crucial for our ability to operate in Afghanistan.
随着我们(美国)与巴基斯坦的关系变得越来越困难，这条供应线对美国在阿富汗的行动来说，是至关重要的。
Heavy smokers and drinkers are at highest risk of developing head and neck cancers, which can be difficult to operate on.
严重抽烟和酗酒者是头颈部肿瘤的极高危人群，而酗酒和抽烟使得手术难以进行。
From the outset, the machine had been difficult to operate and after several accidents, it was decided to modify and simplify the controls.
机器一开始就很难操作。发生几起事故后，决定要修改并简化操纵装置。
However, because of the massive size and long history of the great relic, it is difficult to operate the planning of conservation and development substantively and practically.
但是由于大遗址的规模巨大，历史距今遥远，在遗址的保护利用规划上实质性的可操作保护很难进行。
Observers believe the real purposes may have been to scare off Iranians from working in Western embassies and so make it more difficult for the embassies to operate.
观察员相信，伊朗真正的目的是吓跑在西方大使馆工作的伊朗人，使大使馆的运作更加困难。
China's fund industry is facing many challenges, to focus on the performance of the fund's sale of the difficulties and fund management companies to operate more difficult.
当前中国的基金业面临着不少挑战，集中表现在基金销售的困难和基金管理公司经营难度较大。
Traditional method using tongs and mould with certain extent handwork to operate. It is not only low efficiency and high cost, but difficult to guarantee quality.
传统的制造方法是利用各种夹具和靠模，并辅之一定程度的手工操作来完成加工，不仅效率低、成本高，而且质量难以保证。
However, the method is complicated to operate and it is quite difficult to progress its data.
但此方法操作繁琐，数据处理较难。
Further more, as the application of CRM is a complicated system, it is difficult to operate and to evaluate the effect. These questions need to be further studied and discussed in practice.
另外，CRM的实施本身是一个庞大复杂的系统工程，实施起来有一定的难度，评价其效果也比较困难，这些问题都仍有待在实践中进一步地研究与探讨。
It is very difficult to tap inside Aluminum matrix composites. The process is difficult to operate due to its close condition, and the tap is subject to breaking.
铝基复合材料内螺纹攻丝属封闭切削，加工难度大，丝锥极易折断。
Discontinue use and contact the supplier if a cylinder valve is difficult to operate.
如果钢瓶阀门难于操作，停止使用并同供应商联系。
The operation of complicated lumbar spinal stenosis is difficult to operate and has high risk.
复杂性腰椎管狭窄症手术难度大，风险高。
The M3 Lee and Grant tanks, mounting a 75mm fixed gun, had a high silhouette and was difficult to operate in combat with the heavy German PZKPFW Mark IV and Tiger panzers.
M3‘李’式和‘格兰特’式坦克，装备有75毫米固定主炮，有高大的侧面轮廓，在战斗行动中难以与德国重型的‘马克’IV型坦克和虎式坦克相匹敌。
Further more, as CRM is a complicated system, it is difficult to operate and to evaluate the effect. These questions need to be further studied and discussed in practice.
另外，客户关系管理本身是一个庞大复杂的系统，实施起来有一定的难度，评价其效果也比较困难，这些问题都仍有待在实践中进一步地研究与探讨。
The growing distance between the spacecraft and Earth will make communication increasingly difficult. Still, Tsuda's team hopes to be able to operate the vehicle and collect data for at least a year.
飞船与地球之间的距离日益遥远将会使通讯更加困难，然而，Tsuda的研究小组可以至少维持一年的时间进行控制和信息收集。
However, one-time construction costs of green building is higher, and more difficult to operate and maintain.
但是绿色建筑的一次性建立本钱较高，且运营和维护较低。
However, one-time construction costs of green building is higher, and more difficult to operate and maintain.
但是绿色建筑的一次性建立本钱较高，且运营和维护较低。
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