裂变lièbiàn 1.原子核分裂成两个(或更多个)其他元素的原子核,并放出电子。{fission; process of splitting an atomic nucleus into two or more atomic nuclei of other elements, and releasing electrons} 2.泛指分裂变化{(in a broad sense) split; change through division}: 现代人追求小家庭,大家庭不断～。{Modern people desire smaller families so the extended family is breaking up.}