Because each thread rotate to the opposite on both ends of the screw, the screw rotates, formed by the screw meshing linepump working chamber.
由于每根螺杆两端螺纹的旋向相反，螺杆转动时，由螺杆啮合线形成的泵工作腔。
2
Combination of electric pump-controlled mechanical structure even more than the traditional mechanical-linepump is simple, less the number of parts is expected to achieve higher reliability.
电控组合泵的机械结构甚至比传统的机械直列泵简单，零件数目少，可望达到较高的可靠性。
3
In response to the October 1987 stock market crash, the Fed turned on its money pump and over the next year final sales shot up by 7.5%, well above the trend line.