| 单词 | ballast pocket |
| 释义 | ballast pocket Railroads. a depression that is formed beneath the ballast layer by penetration of ballast particles into the subgrade and that tends to collect moisture. |
| 随便看 |
英语词典包含168451条英英释义在线翻译词条，基本涵盖了全部常用单词的英英翻译及用法，是英语学习的有利工具。