prenatal ultrasound的用法和样例：
例句
- Prenatal ultrasound screening is one of the effective means of intervention for birth defects control.
产前超声筛查是干预胎儿出生缺陷的有效手段之一。 - The SPD and BPD measured by ultrasound would be method for diagnosis of cephalopelvic disproportion in childbearing.
临产前超声测量胎儿双顶径及孕妇骨盆骶耻径可作为产前头盆不称筛查的检测方法而值得临床应用。
