The AIM-9X program made extensive use of engineering prototypes to stabilize the missile's design before building production representative prototypes.
The AIM-9X program created prototypes of the missile's design.
The AIM-9X did not bother to make prototypes of missile designs; they just created the actual missiles straight away.
It means that the competition for mates leads people to spend all their savings.
Macau has such a dense population that they are forced to invest in land reclamation.
Someone is doing laundry.
A boy is playing baseball.
There are at least two men in the street.
The boy is laying in the garden.