bulb of urethra

例句：

1. 1.The doctor found a small bulb of urethra in his patient's penis.
   医生在他的病人阴茎里发现了一个小的尿道球。
2. 2.The bulb of urethra is located at the opening of the bladder.
   尿道球位于膀胱开口处。
3. 3. The bulb of urethra can be a source of infection if not properly cleaned.
   如果尿道球没有得到适当清洁，它可能是感染的来源。