Give the mechanism. 
Definitions:
Defined Benefit Pension Plan
A pension plan where an employer promises a specific payout upon retirement, based on factors like salary history and employment duration.
Pension Expense
The cost recognized by an employer for providing retirement benefits to employees over the current accounting period.
Expected Return
The predicted average of the probabilities of various returns an investment can generate, reflecting the anticipated earnings or loss.
Actuarially Assumed
Refers to statistical calculations and estimates made by actuaries, often related to insurance and pension fund liabilities.
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