例句與造句

1. The series h pump can be a backing pump when combined with another high vacuum smelting , vacuum drying , vacuum impregnate and high vacuum simulation testing , ect
   廣泛地應(yīng)用于真空冶煉、真空干燥、真空浸漬、高真空模擬試驗(yàn)以及其他真空作業(yè)上。
2. It's difficult to find back pump in a sentence. 用back pump造句挺難的