Stefan problem is free boundary condition of physical equation in thermal transfer when the boundary change.

斯蒂芬问题是研究边界变化时导热规律的的物理方程的自由边界条件。

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The state equation of Pieoelectric beam is deduced directly from a piezoelectric physical equation in terms of a plane stress problem.

按平面应力问题，直接从压电物理方程出发，导出了压电梁的状态方程。

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With reducing and regaining constant, it is showed that natural unit and dimensionless transformation are the same in physical equation.

本文给出寻找无量纲变换的一种具体作法，通过物理方程常数的压缩与恢复得出自然单位与无量纲变换相一致的结论。

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We are committed to sharing intimacy, to being friends forever but physical attraction is not part of the equation here.

我们亲密无间，一生一世,有没有激情体验无关痛痒。

耶鲁公开课 - 心理学导论课程节选

By the way, if we go back to this, another big part of disease--chronic disease that's related to diet, is the physical activity part of the equation.

顺便一说 我们回过去看,大多数疾病,与饮食有关的慢性疾病,与一个关于肢体运动的方程式有关

耶鲁公开课 - 关于食物的心理学、生物学和政治学课程节选

Scott Proefrock, an assistant general manager of the Phillies, explains that physical performance is only part of the equation.

FORBES: Staffing Lessons From the Major Leagues

Physical demand for the yellow metal adds another bullish force to the equation.

FORBES: Two-Faced Gold: Trying To Move From Risk Asset To Safe Haven

The scientists used a mathematical equation to prove that the sound arose from imploding bubbles rather than physical contact between the claws.

BBC: Shrimp, bubble and pop