“percussion mark”的概念、定义、翻译、参考文献-科学参考

单词	percussion mark
释义	percussion mark [pǝr`kǝsh·ǝn ´märk] ^GEOLOGY A small, crescent-shaped scar produced on a hard, dense pebble by a blow.
随便看	reversible process reversible steering gear reversible tramway reversible transducer reversible transit circle reversing current reversing dune reversing layer reversing mill reversing motor reversing switch reversing thermometer reversing water bottle reversion revet-crag revetment revived fault scarp revived folding revived stream revolute revolute-coordinate robot revolute joint revolution revolution counter revolution indicator

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