切换实例是一个循环或条件构造吗？
在利用能量协调条件构造应力模式时，最后的应力模式中含有矩阵的逆。
When the stress mode is constructed by energy compatibility condition, the last stress mode involves the inverse matrix.
采用弱协调条件构造有限元，比原来的构造范围更广，井以此构造出几种单元作为算例。
To construct finite elements by the weak conforming condition presented in this paper, we will have a more extensive range of choices, and several elements are constructed as numerical examples.
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