I exercise at the gym for two hours every day.

What do you call 'time' in dialect?

I've been waiting for hours at that shop, but the meal still hasn't come out.

He is using that coat from winter to spring.

You need to use your head to solve this problem.

The accuracy of this experiment is very high.

The astronomer conducted an observation of the night sky.

He likes to observe celestial bodies.

It's difficult to guess his feelings.

How did the ancients live?