B. Infertility may be the presenting complaint for endometriosis. Infertile patients often have no painful symptoms.

不孕可能是内异症的现病史。而不孕的患者经常没有疼痛的症状。

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Ocular symptoms are a frequent presenting chief complaint from patients in the outpatient setting.

在门诊中经常可以遇到以眼部症状为主诉的病人。

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In the Preface, it aims to define the basic categories of the challenge and complaint system, presenting the legislative background, theoretic value and practice importance of studying them.

引言部分，旨在界定质疑与投诉制度的基本范畴，显现对其加以研究的立法背景、理论价值以及实践意义。

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