He has a strong ambition and is always seeking self-improvement.

He is suffering from the misery brought by literacy.

The problem of illiteracy is a serious social issue around the world.

They (referring to women or girls) are my best friends.

The power of this engine is very high.

The refractive index of this lens is 1.5.

The response rate of our survey was 80%.

The ratings for this drama are very high.

The death rate of the new coronavirus varies greatly by country.

The birthrate in Japan is decreasing year by year.