提示在光学穿透性角膜移植术后允许拆线的时间范围内，晚拆线更有利于角膜屈光状态的稳定。
It is suggested that within the permitted time of stitches removal after penetrating keratoplasty, the later the time for removal the better for the stability of corneal refraction.
当它的确切范围被划分后，一个定向能武器专家Doug Beason，把它放在700米，而波束不能穿透一些材料，如铝。
While its exact range is classified, Doug Beason, an expert in directed-energy weapons, puts it at about 700 meters, and the beam cannot penetrate a number of materials, such as aluminum.
瑞雷波波速主要与其穿透深度范围内的介质物理性质有关。
R wave velocity is mostly relative to the nature of media in which wave can penetrate.
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