The crack closure is dynamically measured by means of interferometric strain-displacement gauge(ISDG).

用激光干涉应变-位移测量仪（ISDG）进行了裂纹闭合点的高精度动态测量。

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ISDG, an improved system dependence graph, is proposed in order to better describe relationships in object-oriented programs. ISDG solves the description problem of parameterized objects.

针对面向对象语言程序，提出了一种改进后的系统依赖图：ISDG，用来更好地表示面向对象程序中的依赖关系，从而解决了对象类型参数和属性的表示问题。

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