There are lots of articles researching on pull system model, which often neglecting the defect of parts or assuming the defect level equals to zero directly in production process.
关于拉式系统模型的研究文献很多，但它们往往忽略生产过程零部件缺陷的存在或者直接假设缺陷水平为零。
It is difficult for English learners to use articles in English sentences and the zero article seems to be more perplexing.
英语冠词的使用复杂，很难掌握，而零冠词的使用则更令人困惑。
It is difficult for English learners to use articles in English sentences and the zero article seems to be more perplexing.
英语冠词的使用复杂，很难掌握，而零冠词的使用则更令人困惑。
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