... 难度等级 grade of difficulty 难度动作 element of difficulty; value part 难度分数 difficulty score ...
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The physical ideas are the basic element of physical knowledge, the base of physics and is the keystone and difficulty of physical teaching.
物理概念是组成物理知识的基本元素，是物理学的基础，也是高中物理教学的重点、难点。
The policy is a key element of David Cameron's "Big Society", but suffers from the same difficulty as the overall project: pushing through devolution in a time of austerity is tricky.
这一政策是大卫•卡梅隆“大社会”中的关键一环，但却于整个项目面临着相同的困难：在一个紧缩的时代，向下放权是困难的。
The major difficulty is caused by the deletion of an element that is referenced from a dependent package.
主要困难是由删除依赖包所引用的元素导致的。
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