First, it often deals with areas in which the basic physics or chemistry are well understood, but the problems themselves are too complex to solve in an exact manner.
Kapertama, sering pisan mapaiketan antuk widang-widang ring fisika dasar utawi kimia kauningin antuk becik, sakéwanten pikobetnyané praragan kalintang sukil pacang kapuputang antuk pamargi sané becik.