She was hiding the sadness concealed within her smile.

He will succeed sooner or later.

He may say he's a doctor, but he's actually a veterinarian.

This cheese has a strong butyric acid flavor.

This app provides useful information for everyday life.

His advice was completely useless.

He is very healthy because he exercises every day.

Health is more important than anything else.

The balance of intestinal bacteria greatly affects health.

Butyric acid is one of the components that characterizes the flavor of butter.