On Mars, subrosion is widely observed when rising magma heats frozen ground water, which melts and removes subsurface material as it flows away.
在火星上，当深处上升熔岩加热融化地下水冰时，基底侵蚀非常常见，因为这些地下水会流失，带走地下物质。
There is an urgent need in detecting the cracks on the surface or subsurface of material.
材料表面和表面下浅层裂纹的检测要求越来越迫切。
It is very important for metal load-carrying structure in detecting the cracks on the surface or subsurface of material.
材料表面和表面下浅层裂纹的检测对金属承力结构十分重要。
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