design principle

• 设计原理

design principle的用法和样例：

例句

1. The design principle is the same as household reflex enclosure.
   其设计原理同家用的反射式音箱。
2. None of the new design principles is easy or trouble-free.
   新的设计原理没有一个是简单易行，毫无麻烦的。