现场测试表明，该方法对开口裂缝深度的测试是相当有效的。
The measuring results in field show that the impact-echo method is effective in measuring the depth of surface-opening crack.
你会看到更大的裂缝，然后是沿着岩石的开口形成的通道，这些都在地下。
You get bigger cracks and then passageways being formed along the openings in the rock and it's all underground.
当他终于开口说话时，我觉得他的视线集中在人行道的一条裂缝上。
When he spoke at last, I think his sightline was on a crack in the pavement.
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