本文首先阐述了科技英语的范畴及其文体特点；
This paper first expounds the category and stylistic features of English for science and technology;
语言作为一个符号系统，在科技文体中体现得尤为明显。
Language as a semiotic system is best represented in science and technology writings.
语言作为一个符号系统，在科技文体中体现得尤为明显。
Language as a semiotic system is best represented in science and technology writings.
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