lowadj.低的；少的；低落的；低声的；卑劣的；低等的adv.低地；低声地；低下地；廉价地n.低水平；低价；低谷v.哞哞叫low service低压供水系统

1. The brittleness of high-manganese steel under low temperature is discussed.A method of Iow-temperature cutting with liquid nitrogen freezing of the workpiece has been developed.
   论述了高锰钢的低温脆性，建立了用液氮冷冻工件的低温切削方法。