But there is a limited amount of radio frequency spectrum available.

VOA: special.2010.03.19

It limited the amount of money railroads could demand from people who needed to travel or transport their goods.

VOA: special.2010.05.06

They cannot harm themselves because the amount of painkiller in the pump is carefully measured and limited.

VOA: special.2010.05.04

She limited the amount of time they watched television.

VOA: special.2009.09.04