english: But blood is also challenging, because it has a very short shelf life, there are lots of different storage requirements, and it's really hard to predict the demand for all of these different blood groups before a patient actually needs something.
non_english: Ipak, krv je takođe komplikovana zato što ima kratak vek trajanja, mnogo različitih uslova za čuvanje i zaista je veoma teško predvideti potražnju za sve različite krvne grupe pre nego što pacijentu u stvari zatreba neka.