例句與造句

1. Before steam admission , valve on vacuum hogging extraction line （ the valve is befor hogging pipe of the two stage steam jet ejector ） should be closed ( see also two stages steam jet ejector installation and operation instruction )
   在蒸汽進(jìn)入之前，抽真空啟動(dòng)管道上的閥門(啟動(dòng)抽汽器前的閥門)應(yīng)該關(guān)閉（請參見相應(yīng)的兩級射汽抽氣器安裝使用說明書） 。
2. It's difficult to find extraction line in a sentence. 用extraction line造句挺難的