IV. Cystitis occurs in 0.3 to 1.3 percent of pregnant women. Bacteria are confined to the lower urinary tract in these patients.是什么意思_IV. Cystitis occurs in 0.3 to 1.3 percent of pregnant women. Bacteria are confined to the lower urinary tract in these patients.在线翻译_英语_读音_用法_例句