“roof hole”概念、定义、翻译-科学时代

单词	roof hole
释义	工程与技术词汇手册 roof hole 顶板炮孔；上向炮孔
随便看	target return principle target risk target road engineering survey target road engineering survey target-rod target rod target round target run targetry targetry target sales target saturation target scaled model target scattering characteristic target-seeking target setting theory target signature measurement target simulation target simulation target simulator target species target state estimator target strength target student target theory

科学时代收录了1160609条科普词条，基本涵盖了常见科普常识及英语词汇的翻译，是科学学习和研究的有利工具。

roof hole