英语词汇“hallinger shield”的英英意思、用法、释义、翻译、读音、例句、短语、词组-英语词典

单词	hallinger shield
释义	Hallinger shield Hallinger shield [′hal·in·jər ‚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.
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Hallinger shield