My friend came from China.

His name is China.

You need to use your head to solve this problem.

He is using that coat from winter to spring.

Please use the emergency stairs in case of a fire.

Due to the earthquake, the city declared a state of emergency.

The utility value of this app is very high.

This painting is very valuable.

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

We should cherish friends who share our values.