the use of fire to heat water and produce steam, a new form of energy,enabled machines of unprecedented size and powerto perform certain routine skills much better and much faster than was possible by hand저 문장에서 than의 품사는 뭔가요? 또 was 앞에 생략되어있는게 있나요?
그리고 than이 가질수 있는 품사의 종류좀 가르쳐주세요.. 부탁드려요!!