极大值

maximum value

see 大夫[dai4 fu5]

big; large; great / older (than another person) / eldest (as in 大姐[da4 jie3]) / greatly; freely; fully / (dialect) father / (dialect) uncle (father's brother)

value / (to be) worth / to happen to / to be on duty

extremely / pole (geography, physics) / utmost / top

maximum / enormous