| 单词 | rock bolt |
| 释义 | rock boltnoun Mining, Civil Engineering.a steel or fiberglass bolt inserted and anchored in a hole drilled in rock to prevent caving of the roof of a tunnel or subterranean chamber. Origin of rock boltFirst recorded in 1955–60 Words nearby rock boltrock and rye, rockaway, rock bass, rock beauty, rock blenny, rock bolt, rock boot, rock borer, rock bottom, rock-bound, rock brake Dictionary.com UnabridgedBased on the Random House Unabridged Dictionary, © Random House, Inc. 2020 |
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