But much more time is spent on the nuts and bolts generally called logistics of how to transport and supply an army.

VOA: special.2009.11.01

But they spent a lot of time, energy, and money on being sure that they would have a supply of water to hold them for a long siege.

他们花费了大量的时间,精力,和金钱来确保,在长期的围城中他们可以获得足够的水源

耶鲁公开课 - 古希腊历史简介课程节选

When a baby's head is stuck in the birth canal for an extended period of time, it cuts off the blood supply to the woman's surrounding organs.

VOA: special.2010.08.09

But from the time the organization was established in 2001, the supply has sometimes been as low as 40,000 units.

VOA: standard.2010.06.04