| 单词 | pentice |
| 释义 | pentice [`pen·tǝs] MINING ENGINEERING 1. A rock pillar left, or a heavy timber bulkhead placed, in the bottom of a deep shaft of two or more compartments; the shaft is then further sunk through the pentice. 2. In shaft sinking, a solid rock pillar left in the bottom of the shaft for overhead protection of miners while the shaft is being extended by sinking. |
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