人工膝关节置换选择中既要理解它的共性原则，更要把握它的个性原则，才能达到人工与自然的协调；
We must know not only the common principles but also the individual principals in the choices of total knee prosthesis replacements in order to reach the harmony between people and nature.
通过“等刚度置换”原则，探讨了采用FRP设计汽车壳体并达到金属壳体的性能和要求。
By the principle of equal-rigidity substitution, the design of the automobile shell with FRP is explored and the performance and requirement of the metal shell can be achieved.
讨论了热力学、物质平衡和动力学原则在固态置换反应原位合成复合材料中的应用。
The applications of the principles of thermodynamics, mass balance and kinetics to the synthesis of in situ composites through solid-state displacement reactions has been discussed.
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