It's very difficult to develop new drugs, and the reason it's difficult to develop new drugs is because in the early stages of drug development, the drugs are very risky, and they're very expensive.
Много е трудно да се разработват нови лекарства. Това е така, защото в самото начало на създаването им, лекарствата са много рискови и освен това са много скъпи.