In Japanese society, familism is deeply rooted.

You can measure time with the accuracy of a femtosecond.

This theory is universally accepted.

Fluorine naturally exists in the Earth's atmosphere.

Fluorine is an important element for dental health.

He is a diligent writer, so he writes a diary every day.

He is a diligent writer, so he writes a diary every day.

The fillet steak at this restaurant is exquisite.

He is my godfather.

This area has a lot of unexploded ordnance left over from the war, so caution is necessary.