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。
The duties of the post are difficult to define.
职位的职责难以限定。
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。
What is leadership? Its qualities are difficult to define.
什么是领导?它的品质是很难定义的。
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。
For me, beauty is difficult to define but easy to recognize.
对我来说，“美”是难以定义的，但却可以轻易的理解。
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？
As for the nature of the shells for a moment, it is difficult to define.
至于炮弹的性质一时还很难界定。
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。
Technology is everywhere in modern society, but it is also difficult to define.
技术在现代社会中已经无处不在，但要定义技术却是困难的。
Its qualities are difficult to define. But they are not so difficult to identify.
领导力应具备什么品质很难下定义，但这些品质却不难辨认。
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。
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。
Anusitis is a difficult condition to define and therefore confusing to study.
肛门炎是一种较难定义的疾病，因此研究起来较易混淆。
"Dao" is a difficult concept to define and understand. It is commonly translated as "way."
“道”是一个很难说得清的概念，通常可以翻译成“道路”，也可以翻译为“做法”“方法”“途径”等。
Indeed, the effect is famously difficult to identify, measure, and even coherently define.
事实上，尽人皆知，安慰剂效果难以识别，衡量，以及被清晰地界定。
Indeed, the effect is famously difficult to identify, measure, and even coherently define.
事实上，尽人皆知，安慰剂效果难以识别，衡量，以及被清晰地界定。
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