But what we now know, is that for a number of diseases, there are defects in the system, where the body can't prune back extra blood vessels, or can't grow enough new ones in the right place at the right time.
그러나 질병에 걸리면 몸은 여분의 혈관들을 잘라낼 수가 없고, 적기적시에 새로운 충분한 혈관들을 잘라낼 수가 없는 결함이 생기게 됩니다.