1. Part of the equipment for tunnelling, which pushes into the face.
2. A tree trunk of suitable dimensions fitted with iron handles and used to ram an auger into bedrock.
科学参考收录了60776条科技类词条，基本涵盖了常见科技类参考文献及英语词汇的翻译，是科学学习和研究的有利工具。