It was difficult to sustain prolonged operations in a distant area, in the total absence of repair, logistic and recreational facilities in the vicinity.

The memory erasing is a prolonged and delicate operation, and we must first, with your assistance, devise substitute memories for the time of your absence.

Obviously it's going to be a very prolonged operation.

The 90-page report is sure to provide support for critics of the prolonged American military operations in the Balkans.

Purging units are central because they maintain a clear boundary path and also ensure that the optical system of the instrument remains clean during prolonged operation.

The two establish that the subroutines supposed to make the holograms unaware of things outside their program have malfunctioned due to prolonged operation.

These rescuers are generally not equipped for prolonged operations.

Their purpose was to carry a large number of marines with their weapons, but without the heavy equipment required for prolonged operations.

A prolonged operation would have far-reaching political implications abroad as well as in the United States.

Induction-hardened exhaust valve seats and upgraded exhaust valves were made standard in 1973 to withstand prolonged operation on no-lead fuel.