An equation for the calculation of true shear strain was derived from the integration of infinitesimal shear strain in plane shearing process with constant principal shear strain direction.
对切应变主轴不变的平面简单切变过程，通过无穷小应变的积分，导出了真实切应变计算公式。
Her present mental state is derived from accumulated tension that is generated by he constant quarrels with her husband and the other family members.
她经常与丈夫和其他家庭成员吵架，由此而引发了日积月累的紧张，这就是她目前心理状态的根源。
Combined with modern optimization theory, a method of size optimization for annular fins with constant thickness is derived from theory of heat conduction and temperature distribution in fins.
从热传导原理、肋片的温度分布特性等，与现代优化设计理论相结合，导出了一种关于等厚度环肋的尺寸优化的方法。
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