The significant expansion in scientific research in recent years has enhanced our understanding of the effects of particles on health.
Scientific research has improved our understanding of affects on health.
The scientific research has degraded in recent years.
They are on a boat.
Jon thought this would be difficult.
He has a different attitude than many in the country.
They are going to keep asking for them to pay over the next two months.
A group of people look on as a man sleeps.
The Brill were hungry and had nothing to eat.