A portabledrill or an electric chainsaw could save Labour, and make light of roughing out big boards.
便携钻机或是电动链锯能够节省体力，并使大块木板的粗加工化繁为简。
2
This paper studys noise produced by portableelectricdrill on theory and experiment. It can help find methods of reducing portableelectricdrill noise.
从实验和理论上研究了手提电钻在工作时产生噪音的主要噪声源及其特点，为减少其噪音提供了依据。
3
Mix the high infiltration epoxy ground coat and supplementary firming agent according to certain proportion and Sir The mixture evenly with the portableelectricdrill.