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.

His explanation was impossible to understand.

He loves playing the character of a troll.

Tropylium is one of the important cations in organic chemistry.

Retroviruses can have serious effects on the human immune system.

I know this is sudden, but could you arrange a time for me to meet with the president?

I know this is sudden, but could you arrange a time for me to meet the president?

The expansion of this problem should be limited.