He deeply reflected on his actions.

He was reflecting on his actions.

'Hot' and 'cold' are antonyms.

His criminal act was revealed by the police.

His skills are really not fragmentary.

His room is full of fragments of things.

He was plotting a rebellion against the king.

I bought new gaiters for mountain climbing.

Chemotransmitters play an important role in the transmission of information between nerve cells.

Neurotransmitters are responsible for transmitting information between nerve cells.