rock bolt
noun
A bolt for attaching something to rock; (Mining ) a tensioned rod passing through a bed of rock and anchoring it to the body of rock behind.
Origin
Late 19th century; earliest use found in U.S. Patents.
| 单词 | rock bolt |
| 释义 | rock boltnoun A bolt for attaching something to rock; (Mining ) a tensioned rod passing through a bed of rock and anchoring it to the body of rock behind. Origin |
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