fission
n[U]
1 splitting of the nucleus of an atom with the release of a large amount of energy 裂变: nuclear fission 核裂变.
2 (biology 生) splitting or division of biological cells as a method of reproduction 分裂生殖.
In 1858 an area of poor housing, factories and farm buildings was torn down and Central Park was created, reaching from 59th Street to 110th Street and across three avenues.