This is the 595th most frequent Chinese word.
心理
"心理" means "psychology" or "mental state."
Here, '心理' refers to the field of psychology and mental processes.
这本书讲述了人类的心理活动。
This book discusses human psychological activities.
In this sentence, '心理' refers to a person's mental or psychological state.
他的心理状态非常好。
His mental state is very good.
In this context, '心理' is used to mean someone's thoughts, feelings, or inner workings.