yīhù / rényuán / zài / cāozuò / xīqìqì / qián / xiān / jiǎnchá / dǎoguǎn / shìfǒu / tōngchàng

医护人员在操作吸气器前，先检查导管是否通畅。

Before operating the aspirator, the medical staff first checked whether the tube was unobstructed.