Apologies are always difficult to express.
道歉常常很难开口。
Such constraints are difficult to express in a DTD.
这种约束很难在DTD中表示。
Sometimes it's difficult to express in words what the heart already knows.
有时候，尽管心里已经明白，但很难用言语来表达。
Sometimes, it is difficult to express the feelings that come from within the heart.
有时候，很难把内心深处的感受表达出来。
I find it difficult to express my meaning.
我发现很难表达我的意思。
It can be difficult to express our needs and desires.
很难以表达我们的需要和愿望。
Lonely people, and sometimes it is difficult to express in words.
人的寂寞，有时候很难用语言表达。
I find it difficult to express myself when I have to write in English.
当我要书写英文的时候，我觉得难以表达自己。
In the translation of idioms, it is difficult to express culture elements in them.
受语用学会话含意理论的启发，本文对含有不同文化因素的习语翻译进行了探讨。
At this special moment, I find it difficult to express my complicated feelings by words.
在这特殊的时刻，我很难用言语来表达复杂的心情。
It is difficult to express the good knowledge relation and construct a field knowledge model.
如何表示好知识关系，构建领域知识模型，难度很大。
It is difficult to express the good knowledge relation and construct a field knowledge model.
如何表示好知识关系，构建领域知识模型，难度很大。
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