a clear complexion的用法和样例：
- Hoping for a clearer complexion, preventing spots in advance.
- She lay in the silvery shadows with courage rising and made the plans that a sixteen- year-old makes when life has been so pleasant that defeat is an impossibility and a pretty dress and a clear complexion are weapons to vanquish fate.
- The sky was a clear blue over our heads.
- She retains a clear memory of his schooldays.
- There is a clear division of labor in ants.
- The police kept a clear passage for the traffic.