A gap is created in the wall of the building due to the earthquake.

He made time to meet his friends by squeezing it into gaps in his busy schedule.

A gap gradually developed between him and me.

The White House is the official residence of the President of the United States.

He is majoring in Korean studies at university.

I am majoring in Korean studies at university.

He has an absolute pitch, so his musical talent is very high.

In organic chemistry, cyclodecane is a cyclic saturated hydrocarbon consisting of ten carbon atoms.

In this chemical reaction, cyclooctadecane is the main product.

Pentadecane is produced in this chemical reaction.