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 )
   在蒸汽進入之前，抽真空啟動管道上的閥門(啟動抽汽器前的閥門)應該關閉（請參見相應的兩級射汽抽氣器安裝使用說明書） 。
2. It's difficult to find installation and operation instruction in a sentence. 用installation and operation instruction造句挺難的