The mechanism of this machine is very complex.

A large crack has formed on the floor.

His speech had vocal modulation, which attracted the audience.

His speech had good vocal modulation, making it easy to listen to.

I saw a barn swallow flying in the sky.

His aim is to get promoted in this company.

If a nuclear reactor causes a meltdown, it could lead to a major disaster.

That new store immediately caught my eye.

I encountered a tree rain in the park.

Surprised by the sudden heavy rain, I forgot my umbrella.