“bell hole”的概念、定义、翻译、参考文献-科学参考

单词	bell hole
释义	bell hole [`bel ´hōl] ^{MINING ENGINEERING} 1. One of the holes or excavations made at the section joints of a pipeline for the purpose of repairs. 2. A conical cavity in a coal mine roof caused by the falling of a large concretion.
随便看	aircraft vectoring aircraft weather reconnaissance air crossing air-cure air current air curtain air cushion air-cushion vehicle air-cut air cycle air cylinder air defense air-defense artillery air deficiency air delivery air density air-depolarized battery air diffuser air discharge air-distributing acoustical ceiling air diving air door air dose air drain air drainage

科学参考收录了103327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。