1. Conclusions: It is infrequency, malignant tumor. 结论上皮样肉瘤临床少见，系恶性肿瘤。
2. Underreporting, rather than infrequency, represents the main cause for this limited data, in part due to the lack of centralized databases. 报道不全是这些数据有限的主要原因，而并非发生罕见，其原因部分是由于中央数据库的缺乏。
3. The infrequency of the stomach's being such a source was central to a recent court case in which I participated as an expert witness [see box on page 79]. 然而，正因为胃很少成为口臭的主因，让我最近变成一件法庭诉讼的专家证人（见〈口臭之战〉一文）。
