a symbolic idea的用法和样例：
- Cypress branches used as a symbol of mourning.
- The white bird is a symbol of freedom.
- A matrix used in constructing a symbol or character image on a display screen.
- The michelin restaurant guide use a chef's hat as a symbol of quality.
- They came to venerate him as a symbolic figure.
- A symbol produced by a process such as handwriting, drawing, or printing.