before opemtlon的用法和樣例：
例句
- Conclusion Ultrasuond is a useful tool to find the acute appendicitis diverticulitis before the operation.
結論腹部超聲是術前診斷急性闌尾憩室炎的一種有價值的檢查方法。 - We analyzed the risk factors associated with failing to optimally administer preoperatie antibiotics before primary hip and knee arthroplasty.
我們在這裡就分析了初次髖膝關節成形術前的最佳抗生素應用方式失敗的危險因素。
