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.

You should not underestimate his ability.

His ability is underestimated.

He is overestimating his own abilities.

I think his abilities are overestimated.

We should cherish friends who share our values.

Literary history is like a mirror reflecting the changes in human thoughts and emotions.

He earned a Bachelor of Arts degree at the University of Tokyo.

He is majoring in belles-lettres.