Tangible wear and intangible wear are concepts that describe the decline in the value of machinery and equipment. As a kind of resource, talents also face tangible and intangible wear and tear. The tangible wear and tear of talents refers to the decline of factors such as physical strength, initiative and cooperation related to the physical and psychological conditions of talents with the increase of age and working hours. The invisible wear and tear of talents refers to the decline in the use value of talents due to the relatively backward concepts, knowledge, and methods of talents.
According to the above definition, which of the following is the intangible wear of talents?
After working in the same position for 20 years, Director Liu sometimes feels very irritable and weakened.