Conclusions: It is infrequency, malignant tumor. 结论上皮样肉瘤临床少见,系恶性肿瘤。
The quality or state of being rare; infrequency of occurrence. 罕见，稀有少见的品质或状态；发生的次数不多
The words LZ said seem to be infrequency used, right? 请问这几个单词是哪个词的缩写啊？
The quality or state of being rare;infrequency of occurrence. 罕见，稀有少见的品质或状态;发生的次数不多
With their greater infrequency the sounds increased in strength and sharpness. 寂静的间歇逐渐变长；声音的迟延变得难以忍受。
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。
