不定式作为一种非限定动词，在英语语法体系中占有重要的地位，且在科技文章中常被频繁使用。
The infinitive, being one of the non-finite verbs, occupies an important place in the English grammar. It is frequently used in the scientific and technological articles.
由于PRO出现在非限定句的主语位置，因此汉语中是否存在定式与不定式的区别，是判定汉语中有无PRO存在的关键。
PRO occurs in the subject position of infinitive clauses. Therefore, whether there is finite and nonfinite distinction in Chinese is the key issue concerning the existence of PRO in Mandarin Chinese.
由于PRO出现在非限定句的主语位置，因此汉语中是否存在定式与不定式的区别，是判定汉语中有无PRO存在的关键。
PRO occurs in the subject position of infinitive clauses. Therefore, whether there is finite and nonfinite distinction in Chinese is the key issue concerning the existence of PRO in Mandarin Chinese.
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