1A tube or hollow shaft that moves longitudinally with the piston head in a trunk engine, usually taking the place of the cross-head.
2A cylindrical metal or ceramic sleeve that lines a cylinder inside which a cylinder moves.
Late 19th century.
英汉双解词典包含464360条英汉词条，基本涵盖了全部常用单词的翻译及用法，是英语学习的有利工具。