本文提出了一种基于冲击弹性波的无损检测技术（简称表面波法）。
This paper introduces an impact elastic-wave based NDT method suitable for detection of such deep cracks.
三元乙丙橡胶基本上是一种饱和的高聚物，耐老化性能非常好、耐天候性好、电绝缘性能优良、耐化学腐蚀性好、冲击弹性较好。
EPDM is a saturated polymer basically, have good characteristics of resistance to aging, weather resistance, excellent electrical insulation properties, good chemical resistance, impact elasticity.
随着月球变得越来越冷，越来越没有弹性，来自大型冲击体的回弹变得不完整。
As the Moon grew cooler and less elastic, rebound from large impactors would have been only partial and incomplete.
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