His hobby is astronomical observation.

He likes to observe stars.

This instruction book is easy to understand even for beginners.

The astronomer conducted an observation of the night sky.

He likes to observe celestial bodies.

That battlefield was truly a hell of agonizing cries.

Beautiful Chinese elder is blooming in my garden.

He played the ninth note of the shí-èr-lǜ, Isoku, on the piano.

My son says he wants to become a doctor.

I think that adding anything more to this already perfect function would be superfluous.