一、引言系统功能语言学家韩礼德认为,“隐喻现象并不仅限于词汇层面,而且常常发生在语法层面,这便是语法隐喻”。之后,国内外学者纷纷将语法隐喻理论应用到不同文体的语篇分析当中。科技文本由于具有逻辑性、客观性强,语言简洁,语法结构简单,词汇 I. INTRODUCTION Halliday, a system functional linguist, believes that “the phenomenon of metaphor is not limited to the lexical level, but often occurs at the grammatical level, which is the grammatical metaphor.” After that, domestic and foreign scholars have applied grammatical metaphor theory to discourse analysis of different styles. Because of scientific and logical text, objectivity, language concise, grammatical structure is simple, vocabulary