劍橋詞典used to describe a crime that is the most serious of its type , especially because of being planned and intended 一級(jí)的，最嚴(yán)重的（犯罪） first-degree murder /felony /assault 一級(jí)謀殺/一級(jí)重罪/嚴(yán)重侵犯 比較second-degree 返回 first-degree