reduction of intussusception by barium enema

例句：

1. 1.The government is reducing the number of cars on the road.
   政府正在减少道路上的汽车数量。
2. 2.The company is reducing its expenses by cutting back on unnecessary spending.
   该公司通过削减非必要开支来减少其开支。
3. 3.The reduction in population has led to a decrease in crime rates.
   人口减少导致犯罪率下降。