1.In spite of infrequency, complications secondary to placement of these surgical drains occur.
尽管不常见，但因放置外科引流管导致的合并症仍会发生。
2.Conclusions: It is infrequency, malignant tumor.
结论上皮样肉瘤临床少见，系恶性肿瘤。
3.With their greater infrequency the sounds increased in strength and sharpness. They hurt his ear like the trust of a knife;
随着频次变少，声音变得越来越大，越来越尖锐，像刀子一样刺痛他的耳朵；