The term 'mental illness' is difficult to define.
“精神病”这个词很难下定义。
Treatment is difficult once the abuse becomes a long-term behavior, she noted.
她说道，一旦滥用吸入剂成了长期的行为，治疗就会变得非常困难。
The term "quality of life" is difficult to define.
生活质量"这个词不好下定义。
In the short term, it is difficult to distinguish management skill from luck.
短期内，很难区别管理人的技能与运气。
In the medium term that should not be too difficult.
这在中期是不难实现的。
Will it be more difficult this term because defenders know more about you?
本赛季是否更加艰难，因为后卫们对你更为熟悉？
A term often difficult but in the long term pays off.
这一过程十分艰难，但从长远来看是值得的。
English is one of the most difficult subjects this term.
英语是这学期最难学的课程之一。
In the short term, from the screw machinery for considerable energy saving appears more difficult.
要在短期内，从螺杆机械上获取可观的节能则显得更为艰巨。
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。
On such a project, it is difficult to see short-term to the proceeds.
在这样一个项目，很难看到短期措施的收益。
At the beginning of the term, I found it difficult to study English.
在这学期初，我感到学英语很困难。
At the beginning of the term, I found it difficult to study English.
在这学期初，我觉得学英语很困难。
Lung cancer is a difficult cancer to treat - long term survival rates are poor.
肺癌是一个困难的癌症治疗，长期生存率都不高。
This is a group of people who would find it extremely difficult to stay in a long-term relationship.
这群人会发现，维持一段长期的恋爱关系是极其困难的。
Indeed, the first semester did prove difficult, but I experienced continuous progress with every term.
事实上，第一学期相当艰难，但我在往后的每个学期都获得了持续的进步。
Indeed, the first semester did prove difficult, but I experienced continuous progress with every term.
事实上，第一学期相当艰难，但我在往后的每个学期都获得了持续的进步。
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