Indefinite nominal phrases are ruled out from subject position syntactically. However, counterexamples are easily found.
然而，不确定性的名词短语出现在汉语主语位置的反例却大量存在。
参考来源 - 汉语中作主语的确定性和不确定性名词短语的句法和语义研究In the fifth chapter,we main study the indefinite least square problem（ILS）,we first define a new generalized invers—generalized weighted M-P inverse（also named indefinite least square generalized inverse） and study some properies of it.
第五章主要研究了不定最小二乘问题。 首先定义了一种新的广义逆—广义加权广义逆又称为不定最小二乘广义逆,同时研究这种广义逆的一些性质和计算方法。
参考来源 - 矩阵广义逆的性质、计算和几类线性系统的研究·2,447,543篇论文数据，部分数据来源于NoteExpress
"must you be so indefinite?"; "amorphous blots of color having vague and indefinite edges"; "he would not answer so indefinite a proposal"
"were indefinite about their plans"; "plans are indefinite"
以上来源于: WordNet
ADJ If you describe a situation or period as indefinite, you mean that people have not decided when it will end. 不确定的
The trial was adjourned for an indefinite period.
审判被无限期推迟。
ADJ Something that is indefinite is not exact or clear. 不明确的
...at some indefinite time in the future.
…在未来不确定的某个时间。
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