问题描述：
英语翻译
unfortunately,as we will discover,no single theory will be found to apply in all cases for example,theories that are satisfactory for ductile materials are not acceptable for brittle materials.
We also find that one of the best theories is too complex for everyday use and that most designers prefer a simpler theory that introduces a small but safeside error
unfortunately,as we will discover,no single theory will be found to apply in all cases for example,theories that are satisfactory for ductile materials are not acceptable for brittle materials.
We also find that one of the best theories is too complex for everyday use and that most designers prefer a simpler theory that introduces a small but safeside error
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