The utility value of this app is very high.

In Marxism, surplus value refers to the part of the value produced by workers, excluding the part necessary to maintain their own livelihood.

He is a famous historian and has written many history books.

He is majoring in history at university.

He is trying to hide his embarrassing past.

He recognizes the importance of oral history.

He interprets world events from a historicism perspective.

He has a very passive personality.

He is always the type of person who says this when that is said.

I acted just as he said.