Other cracks with complicated shapes, such as the "hook" crack, the "zigzag" crack, the "chevron" crack and the "umbrella" crack, consist of the above mentioned three basic cracks.
钩形、“人”字形、“之”字形、伞形等形状的微裂纹是由这三种基本形状的微裂纹构成的。
Other cracks with complicated shapes, such as the "hook" crack, the "zigzag" crack, the "chevron" crack and the "umbrella" crack, consist of the above mentioned three basic cracks.
钩形、“人”字形、“之”字形、伞形等形状的微裂纹是由这三种基本形状的微裂纹构成的。
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