It is essential to conduct basic study on crack movement for twin-arch tunnels, and in-situ monitoring is one of the feasible methods.
开展裂缝运动特征的基础研究，进行大量现场监测并总结规律是可行的方法。
With the basic view of narrow principle of relativity and straightaway language, the article expounds the true and false of twin falses and offers readers a clear answer.
从狭义相对论的基本观点出发，阐述了“孪生子佯谬”的真伪，给广大读者一个明确的答案。
The basic principles of the method are described, and some numerical examples of the radial cracks appearing at the boundary of twin, three and four circular holes are calculated.
文中阐明了这种复变应力函数迭加解法的基本原理，并用此方法计算了双孔、三孔和四孔边裂纹板的若干数值例子。
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