hierarchical order短语¹⁸⁰⁰⁹⁸⁺¹ 基本例句 分级次序 The hierarchical order can be best illustrated with a tree diagram of constituent structure, so called because such a diagram looks like an inverted tree. 句子结构的层次性可以用成分结构树形图加以充分说明。这种图看起来像一棵倒置的树，因此叫做树形图。 blog.sina.com.cn