| 单词 | shield |
| 释义 | shield [shēld] ENGINEERING An iron, steel, or wood framework used to support the ground ahead of the lining in tunneling and mining. GEOLOGY 1. The very old, rigid core of relatively stable rocks within a continent around which younger sedimentary rocks have been deposited. Also known as continental shield. 2. See <<palette>> NUCLEONICS The material placed around a nuclear reactor, or other source of radiation, to reduce escaping radiation or particles to a permissible level. Also known as shielding. ORDNANCE Armor plate mounted on a gun carriage to protect the operating mechanism and gun crew from enemy fire. |
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