physical design

例句：

1. 1. The physical properties of the material are important for its use.
   这种材料的物理性质对其使用很重要。
2. 2. The scientist's theory is based on physical principles.
   科学家的理论基于物理原理。
3. 3. The physicist studied the behavior of electrons in a magnetic field.
   物理学家研究了电子在磁场中的行为。