Obesity drugs have proved difficult to develop, and only a few have entered the marketplace.
事实已经证明很难开发减肥药，只有少量药物进入市场。
Because these concerns are not easily separated, the solution can be difficult to develop and maintain.
因为这些方面不容易剥离出来，所以这种解决方案很难开发和维护。
For developers who have Web application experience, it's not difficult to develop multimodal applications.
对于具有Web应用开发经验的开发者来说，开发多模式应用系统并不是一件困难的事情。
But a full DSL approach could be difficult to develop in a large group with several business units that are distinct from each other.
然而，如果一个较大的组织中存在几个截然不同的业务单元时，整套DSL方法开发起来还是比较困难的。
Diagrams are crucial, since without them, it is difficult to develop an understanding of the model and, hence, the system it represents.
图是决定性的，因为没有它们，理解模型是很困难的，因此理解模型代表的系统也是很困难的。
Gully and slope land in towns are relatively difficult to develop and protect.
城镇内部冲沟坡地是开发和保护难度都较大的区域。
One habit that is very difficult to develop is finding the time to read every day.
每天抽空阅读是一个很难培养的习惯。
It is considered that it is difficult to develop a program, but easy to test a program.
人们常常以为，开发一个程序是困难的，测试一个程序则比较容易。
It is very difficult to develop the deep thin reservoirs using the conventional horizontal drilling technology.
利用常规水平井技术开发深部薄油层有较高的技术难度。
Prof. Jensen : I think it is difficult to develop global guidelines for hepatitis C treatment for several reasons.
我认为很难制定全球丙肝治疗指南，原因有几个。
It is difficult to develop the small fault-block reservoir for its complicated geologic conditions in Machang Oilfield.
马厂油田是一个地质条件较为复杂的小断块油田，开采难度大。
As more flat file inbound flows are added to the solution, the code base becomes unnecessarily large and difficult to develop and maintain.
随着向解决方案添加越来越多的平面文件入站流，代码库会变得过于庞大，难于进行开发和维护。
Many specifications are involved with PCI bus and interface explanation is complicated, so its difficult to develop the stable PCI bus equipment of high performance.
PCI总线涉及的规范比较多，接口说明复杂，开发出高效、稳定的PCI总线设备具有一定难度。
Because its occurring conditions, factors and mechanism are variable and complex, it is very difficult to develop a precise mathematical model to make the overall description.
由于污垢产生条件、影响因素及作用机理的复杂性，目前很难用一个数学模型对其进行准确的描述。
However, since the field knowledge of power system is characterized with a lot of experiential knowledge, it is a bit difficult to develop an expert system with study function.
然而，由于电力系统领域知识往往具有经验性知识较多的特点，所以开发具有学习功能的专家系统有一定难度。
The hardware environment for the ASP software is already full-fledged at present. But it is still difficult to develop and publish such kind of software for most software developers in China.
国内运行ASP模式软件的硬件条件目前已基本成熟，但开发并发布一套完善的ASP模式软件对于国内大多数软件开发商而言，仍然存在一定的难度。
The hardware environment for the ASP software is already full-fledged at present. But it is still difficult to develop and publish such kind of software for most software developers in China.
国内运行ASP模式软件的硬件条件目前已基本成熟，但开发并发布一套完善的ASP模式软件对于国内大多数软件开发商而言，仍然存在一定的难度。
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