He had been suffering from illness for a long time.

He is deeply interested in the theory of communism.

We need to find the real root of this equation.

I always laugh at his comical expression.

I like reading stories of the past and the present.

What is your favorite romcom?

Please be careful as there is a possibility of contamination in this area.

This water might be contaminated, so please do not drink it.

The lesser roadrunner is a bird that can run very fast.

In organic chemistry, nonatriacontane is a saturated hydrocarbon consisting of 39 carbon atoms.