Another piece called Trace, some abstract, is the image like old tree's growth ring, water's wave or wind's mark.

而另一幅作品《痕》，宛如塑造了岁月的年轮，或者水的波纹，风的痕迹。

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Rock P-wave velocity as a key mark of rock quality can reflect the state of rock body quality in the dam site area.

岩体波速作为反应岩体质量的重要指标，可以反应坝址区岩体质量状况。

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Rock P-wave velocity as a key mark of rock quality can reflect the state of rock body quality in the dam site area.

岩体波速作为反应岩体质量的重要指标，可以反应坝址区岩体质量状况。

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