single proprietorships

• 单胎妊娠

single proprietorships的用法和样例：

例句

1. The animal model of partial unilateral ureteral obstructive hydronephrosis in single mid-term fetal lambs could be produced by intrauterine surgery.
   对山羊单胎妊娠中期胎羊进行宫内手术建立胎儿单侧输尿管梗阻性肾积水的动物模型是可行的。