“Hallinger shield”的概念、定义、翻译、参考文献-科学参考

单词	Hallinger shield
释义	Hallinger shield [`hal·in·jǝr ´shēld] ^{MINING ENGINEERING} A tunneling shield valuable for working in very soft ground; incorporates a mechanical excavator and does not entail the use of timbering to protect the miners.
随便看	operational game operational label operational maintenance operational standby program operational unit operational weather limits operation analysis operation analysis chart operation breakdown operation code operation cycle operation decoder operation number operation part operation process chart operation register operations research operations sequence operation time operative ankylosis operator operator algebra operator hierarchy operator interrupt operator process chart

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