sinovaginal bulb

例句：

1. 1. The sinovaginal bulb is a small sac that holds the tissue of the vagina.
   阴道球是一个小囊，容纳着阴道的组织。
2. 2.During menstruation, the sinovaginal bulb can become inflamed and painful.
   月经期间，阴道球可能会发炎并疼痛。
3. 3. A woman's sinovaginal bulb is often larger than a man's.
   女性的阴道球通常比男性的大。