Years of civil war have 'drained' the country 'of' its resources. [=have used up the country's resources]
Nothing has been done to stop the 'brain drain' as more and more doctors move away from the area.
When the beans have cooked long enough to be tender, 'drain off' the water and set them aside.
(..) - I have seen nothing - What does this mean, my lord? - The king doth wake tonight and takes his muse Keeps wassail and a swaggering upspring reels, and as he drains his drafts of rhenish down... ...the kettledrum and trumpet thus bray out the triumph of his pledge - Is it a custom? (..)2015 Hamlet