about accounting explain 2 tables about pension plan from 10 k

Please explain each line of the 2 tables, for example,

service cost means Employees work for you this year and earn benefits to be paid in the future. Service cost is the present value of the actuaries estimate about how much your employee earned as a result of working just this year.

For each item, 1 or 2 sentences would be enough.

I would post some materials later.

Bid only you are good at accounting, thanks