At the early stage of the study of EST, people mainly focus on superficial language phenomena such as word formation, grammatical structure, tense, voice, etc.
科技英语的研究初期，人们主要注意的是诸如词汇构成、语法结构、时态、语态等表层语言现象。
Finally, other critical grammatical issues in translation such as the proper use of tenses, the passive voice and modal auxiliaries are analyzed in great detail.
另外，论文还详细研究翻译实践中诸如时态，被动语态，情态动词等重要的语法问题的处理。
Passive voice is one of the important grammatical items in English.
被动语态是一个重要的语法项目。
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