The term 'mental illness' is difficult to define.
“精神病”这个词很难下定义。
It is difficult to define what makes him so popular.
很难解释清楚什么原因使他如此走红。
It's difficult to define the exact nature of the problem.
很难给这个问题确切定性。
It is difficult to define the border between love and friendship.
爱情和友情之间的界线难以划清。
It is difficult to define love.
给爱情下定义是很难。
Its qualities are difficult to define.
它的品质是很难定义的。
It is extremely difficult to define these terms.
给这些术语下定义太难了。
The term "quality of life" is difficult to define.
生活质量"这个词不好下定义。
It is very difficult to define what is historical.
这是很难界定什么是历史。
Social morality is illusive and difficult to define.
社会道德是难以界定、难以定义的。
Happiness is difficult to define and even harder to measure.
快乐难以界定，更难以测量。
Perhaps it is not so difficult to define happiness after all.
幸福是什么模样，或许并不难回答。
Accent is something somewhat difficult to define and categorize.
重音是很难定义和分辨的。
Why is difficult to define, or rather discover and achieve happiness?
为何很难定义、发现和获得幸福？
The term "quality of life" is easy to understand but difficult to define.
生活质量这个术语容易理解但很难下定义。
The eclecticism of the designs means it is difficult to define one overall look.
这些设计中的兼收并蓄意味着难以界定一个总体的风格。
They also said it was too difficult to define what was racially or culturally offensive.
他们还表示，现在很难界定什么是种族性或文化性冒犯。
It is difficult to define the detection limits obtained by chelation-solvent extraction.
确定螯合——溶剂萃取法所得到的检测限颇为困难。
The fourth generation of computers is more difficult to define than the other three generations.
第四代计算机比其他三代更难以定义。
Although liquidity's importance to stock market is notable, it is difficult to define and describe.
尽管流动性对股票市场的重要性是显然的，但流动性本身却是一个难以捉摸和准确定义的概念。
The relationship of Sensei to the dojo is very difficult to define as it encompasses many aspects of life.
空手道老师对于道场的关系是很难定义的，因为它包括生活中的许多方面。
The second quality which I demanded in a significant idea was depth, and this is still more difficult to define.
我认为一个重要的观念必需的第二个品质是“深度”，这个更加难以定义。
It has continued to be difficult to define and check individuals' performances after this and other instructions.
在许多不同的指令后确定并检查个体的表现是很困难的。
Unfortunately, thread safety is not an all - or - nothing proposition, and it is surprisingly difficult to define.
不幸的是，线程安全并不是一个非真即假的命题，它的定义出人意料的困难。
Although several conditions have been linked to stillbirth, it is difficult to define the precise etiology in many cases.
虽然许多种情况与死产有关，在许多病例中很难定义准确的病因。
If not set ahead of time, it is difficult to define whether the performance of the application being tested is adequate or not.
如果您没有提前设置，那么您很难定义被测试的应用程序的性能是否是足够的好。
If not set ahead of time, it is difficult to define whether the performance of the application being tested is adequate or not.
如果您没有提前设置，那么您很难定义被测试的应用程序的性能是否是足够的好。
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