【正确答案】正确答案：The tree diagram can not only reveal a linear order, but also a hierarchical structure that groups words into structural constituents. It can, in addition, show the syntactic category of each structural constituent, thus it is believed to most truthfully illustrate the constituent relationship among linguistic elements.

【答案解析】解析：（本题考查用树形图分析句子结构的好处。)