试题题干
Unlike radiation where each of the derived meanings is directly connected to the primary meaning, （ ）describes a process where each of the later meaning is related only to the preceding one like chains.
参考答案
正确答案：
试题解析
词义发展有两种模式：radiation（辐射型）和concatenation（连锁型）。辐射模式以原始意义为中心，从原始意义发展而来的次要意义像射线一样四处散去，意义之间互不关联；连锁模式试试一个词的词义逐渐从原始意义连续转化。