静止时，患者小腿和大腿如果有不舒服和难以表述的感觉，那么这就是腿部不宁综合症。
Restless legs syndrome is present when a peculiar and difficult-to-describe sensation occurs in the calves or thighs while at rest.
语言信息一般表征为符号形式，但是如此表征难以表述发话和理解过程。
Linguistic information is usually represented in symbolic form, but this practice makes it difficult to account for the processes of speaking and understanding.
难以理解的抽象表述使我对学习感到厌烦。
The difficulty of grasping abstract statements made my learning very tiresome.
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