The presence of invertebrates in main supplies is discussed.
Sorting out the main drug supply is harder, but it does not appear to have been broached at all, as yet, even though the village health teams (VHTs), which are the mainstay of Amref's health programme, have no malaria drugs.
The main blood supply is through retrograde branches of the radial artery.
The main sediment supply is provided by an intensive West-to-East longshore current, transporting sand material from Portuguese cliffs and the Guadiana River.
At the moment, the main source of supply is in China, whose government has used its near-monopoly to restrict availability and push up the price.
In Europe, the main source of supply is the cluster pine, Pinus pinaster, extensively cultivated in France in the départements of Gironde and Landes.
However, this week China's foreign-exchange agency said gold would not become an important element of the country's official reserves.The third main source of supply is scrap: jewellery sold to dealers for the value of the metal.
Main ("grid") electrical supply is often unreliable and subject to wide voltage fluctuations.
Sydney, the biggest city, whose main supply reservoir is just 40% full, and Canberra, the capital, are both on indefinite water restrictions.
If your main water supply was from the bathroom too, would you be happy?
