Once perfected however, the drive is little used, as it is fearfully costly in energy use and still very risky.

Once perfected, the XF- 34A DrearnStar fighter would be the nation's new air-superiority fighter.

Once perfected, Emerson named the creation Fizzies.

Once perfected, there will be no need for schools or universities.

Once perfected, approximately 50 of the systems were erected and used to irrigate seedlings on the hillside in an attempt at reforestation.

Once perfected, if ever, W.I.S.O.R. will service a system developed in the 1860's and still attached to around 2,200 buildings around the city.

Once perfected, it was simple and informative.

Once perfected, samadhi is the main tool used by a yogin to penetrate into the deeper layers of consciousness and seek the center of the yogin's consciousness.

Once perfected, it would allow direct communication between computers and the human mind.