Because tritium decays, warheads need periodic replenishment of the gas or they cannot function.

"The state's dedicated transportation fund needs replenishment now," he said, adding that new funds would not be easy to obtain.

"I thought nuclear carriers didn't need replenishment."

Need replenishment after a workout?

Our stores of provisions, supplemented by our guns, were holding out well, but the day must come when they would need replenishment.

Although there is an initial cost for plants, native perennials need little upkeep and do not need annual replenishment.

In consequence, the B vitamins need ongoing replenishment.

No tribute had been collected in 449/8, perhaps because the funds did not need replenishment, but in 448/7 the contributions were far below normal.

They stock products that need frequent replenishment.

It only knew that forty million years had not been kind to its own systems, and it needed replenishment.