在设计原理图时有必要折衷两方面：使示意图具有目了然的详细性和便于阅读和理解的简单性。
A In designing schematic diagrams, it may be necessary to combine two aspects: specification necessary to make the diagram clear, And the simplicity essential for ease of reading and understanding.
B In designing schematic diagrams, it may be necessary to comprehend two aspects: detection necessary to make the diagram self-contained, And the simplification essential for ease of reading and understanding.
C In designing schematic diagrams, it may be necessary to compromise two aspects: detail necessary to make the diagram self-explanatory; And the simplicity essential for ease of reading and understanding.