The three men in the station immediately started activating its vital systems.

Each vessel has barely enough crew to maintain vital systems.

Unless we start rerouting power from vital systems, they're not going to protect us much longer.

To conserve power, the crew has now shut all but the most vital systems.

"But why do they consider the possession of this system so vital?"

Your people have been most kind in helping us repair vital systems.

Khan couldn't even begin to guess what sort of damage had been done to the submarine's vital systems and functions.

One problem that has come to light is the need for much greater care in checking balloons and all their vital systems before launching.

It would not have touched any vital internal systems.

Too many of this drone's vital systems have been damaged or destroyed.