He entered the forest with a shotgun.

This factory uses fuel oil as its main fuel.

I am planning to go to Chongqing next week.

He was obedient to what his parents said.

He cooked using a gas stove.

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

Neurotransmitters are responsible for transmitting information between nerve cells.

Sufficient caution is necessary when handling radioactive materials.

I have been to Philadelphia.