这些数学对象是抽象的，不易掌握的外行人士。
These mathematical subjects are abstract, not easy to grasp for uninitiated persons.
第二类换元法是一种既重要又不易掌握的积分方法。
The second method of transformation is an important but not-easy-to-master calculus method.
现代控制论应用状态空间方法表示，概念抽象，不易掌握。
The modern cybernetics, which is expressed by the state-space formulation, is too difficult to understand because of its abstract concepts.
以管理者为主体，主观取舍信息，不易掌握用户真正的需求。
Take the superintendent as the main body, subjectively takes the shed information, is not easy to grasp the user true demand.
目的：传统的细菌革兰氏染色法操作繁锁，初学者不易掌握，寻找一种简便方法。
Objective: As the classical Gram's staining (G) is difficult to control for junior technicians, a substitute method which is easy to master was found by the authors.
手控定量气雾剂适合龄儿童使用，操作要求高，需要脑、口、手的协调配合，不易掌握；
The manual fixed-quantity aerosol can be used in the treatment on the high-aged children, but it has a high requirement of the operation and needs the harmonious cooperation of brain, mouth and hands.
生命是变化莫测的，万物实体是极不易掌握的，道运筹的准则是无穷无尽、深奥而不明的。
It is difficult to master the frequently-changing life and entity of all things; the operational rule of Tao is limitless, profound and obscure.
在众多因素中，经济和社会等因素的变化规律相对来说不易掌握，而人口变动的规律性则相对稳定。
Among the many factors, economic and social changes of such factors are relatively easy to master, and demographic changes in the law is relatively stable.
虽然此命令的功能非常强大，可以解决许多问题，可是对许多人来说，尤其是初学者来说，却非常不易掌握。
Although this order is very powerful, can solve many problems, but for many people, especially beginners, very hard to grasp.
当然我们可以为她找或者是尽量为她找到一间公寓和工作；在她这样的年龄，工作已不易找到，尽管她的身体还非常健康，在我们的缝纫厂里掌握了很好的缝纫技能。
Of course we can find or try to find her an apartment and a job; a job will be difficult at her age, even though she is in excellent health and has shown great skill in our sewing shop.
结果：运用此法教学，学员可在较短的时间内掌握所要求的护理技术旦不易遗忘。
Results: Students can master the nursing skills and can not forget it in a short period when this teaching methods were used.
实验教学受条件所限，研究生不易全面掌握各项实验技术。
The teaching of practice is limited and all the skills are hard to master for the postgraduates.
不易贮存的留样，可根据实际情况掌握保存时间。
For those difficult to preserve, the preservation period shall depend on the actual circumstances.
形状复杂的铸件热节多，相互之间又有较大的影响，其凝固过程不易准确掌握，这就为铸造工艺设计带来困难。
The solidification process of complex - shape casting is too complex to analyse with experiment or experienced method. This causes it very difficult to design the casting process correctly.
掌握词汇是英语学习的重要任务，也是不易完成的任务。
Vocabulary is an important part in language learning. And it is a difficult task.
而我们只有掌握上帝的节奏，才能够重新获得力量和美丽，…鳟鱼跟永恒的救赎一样，都是上帝的恩典，这恩典来自于艺术，而艺术来之不易。
And that only by picking up God's rhythms, were we able to regain power and beauty..., trout as well as eternal salvation come by Grace. And Grace comes by art. And art does not come easy.
而我们只有掌握上帝的节奏，才能够重新获得力量和美丽，…鳟鱼跟永恒的救赎一样，都是上帝的恩典，这恩典来自于艺术，而艺术来之不易。
And that only by picking up God's rhythms, were we able to regain power and beauty..., trout as well as eternal salvation come by Grace. And Grace comes by art. And art does not come easy.
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