| 单词 | penetration |
| 释义 | penetration [´pen·ǝ`trā·shǝn] AEROSPACE ENGINEERING That phase of the letdown from high altitude to a specified approach altitude. METALLURGY 1. The distance from the original surface of the base metal to that point at which weld fusion ends. 2. A surface defect on a casting caused by molten metal filling voids in the sand mold. ORDNANCE Distance to which a projectile sinks into a target. |
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