a marked change in behavior的用法和样例：
- A marked change in appearance, character, condition, or function.
- A marked change in topography such as a fault or deep valley.
- A marked change in form or appearance; a metamorphosis.
- In the oast few years, there is a marked change in attitudes towards...
- A passenger in an airplane would notice a marked change in the atmosphere on passing an elevation of 11 km.