由于管片内部裂缝观测难以实现，故重点研究了表面裂缝的影响。
Because the observation of interior crack is not always available, this paper laid emphasis on surface crack of segments.
声发射技术已经应用于金属和混凝土结构中，作为探测内部裂缝的一种无损检测方法。
Acoustic emission (AE) technique has been applied to metallic and concrete structures as a nondestructive testing (NDT) method for detection of internal cracks.
如果一只蚂蚁找到了一个出色的洞穴——比如橡子或岩石裂缝的内部——它就会叫来另一只侦察蚁对洞穴进行检查。
If an ant finds an outstanding hole—such as the inside of an acorn or a rock crevice—it recruits another scout to check it out.
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