Grammatical metaphor not only breaks the limitation of lexical metaphor research theoretically, but also enhances the features of scientific precision, conciseness and objectivity practically.

• 语法隐喻的提出，不仅从理论上弥补了隐喻研究只停留在词汇层面的不足，而且通过语法功能的隐喻化使科技英语保留了其精确、客观、简洁的文体特征。