Living vaccine and killed vaccine have some formidable drawback , so biological technology vaccine , for example , gene vaccine and genetic engineering vaccine , is under the circumstances 现在使用的弱毒苗和灭活苗都存在着一些难以克服的缺点，基因免疫和基因工程疫苗等生物技术疫苗的研制已势在必行。
Develop an advanced method : adaptive grouping method in order to resolve the problem that the number of unknown parameters is always great than the number of equations of the algorithm of iceit , 4 针对目前iceit成像算法中存在且难以克服的未知数比方程数多的问题，提出一种改进的算法?自适应分组算法。
But it is difficult to protect traditional knowledge with modern intellectual property system owing to its long history and collective creativity and oral spread 由于传统知识的传统性、集体性、相对公开性等特性使得通过现有知识产权制度保护传统知识存在难以克服的障碍,所以有必要构建传统知识保护的特别法。
Distributed management is weak in that it will be difficult to change after the operational phase has started the functionality that makes the management decisions 在分布式管理模式下，不同的用户往往要应用彼此冲突的管理功能，因此很难避免由此引起的相互干扰；此外安全问题也是分布式管理难以克服的一大缺点。
These efforts ensure that new noise - sensitive receivers such as homes and schools will not be exposed to excessive noise and new infrastructure will not cause insurmountable noise problems 透过参与规划，政府确保对噪音感应强的地方例如住宅及学校日后不会受过量噪音滋扰，而新的基建设施亦不会引致难以克服的噪音问题。
By making deeper research , we can know that the error is connected with electromagnetic ' s anti - jamming capability tightly , especially the disturbance from sensor and it ' s inner circuit , which are hard to be got rid of 这与其干扰有着密切的联系，尤其是与其传感器上的干扰和硬件电路板上的干扰，而这二者又都是难以克服的。
Functionalism has great influence on how to resolve mind - body problem and many people support functionalist ' s way , but when facing internationality , qualia and input - output problem , functionalism has so many difficulties 功能主义虽然影响很大，支持的人数也很多，但是在面对意向性、感觉性质和输入与输出问题时却面临着难以克服的困境。
A large number of private data are transformed in the internet , and electrical commerce is more and more popular . all these challenge the traditional method of copyright protection and technology of data security 大量私有数据在网络上的传播、网络交易的日益风行，都使传统的版权保护手段和数据安全技术面临极大的挑战和某些难以克服的困难。
The three open - ended fund companies that are huaan innovation , southern steady growth and huaxia growth have set up and developed in 2001 , and it marked a new development stage in the progress of china ' s mutual fund industry 作为一种金融产品和金融工具,开放式基金与其他金融产品相比有着不可替代的优点,同时也不可避免地存在其自身难以克服的缺陷。
