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- Secondly, cell interpenetration engendered during bubble phase is the micro crack of the foam and acted as defects of the material. 2.;聚氨酯硬泡发泡过程中形成的泡孔互穿是材料断裂微裂纹的形核地点，材料的断裂基本属于脆性断裂，但是也有部分的韧性断裂。
- The study shows that the effects of stacking sequence are significant on crack origination, crack extension rate, fracture toughness and crack density. 研究发现不同铺层顺序不仅影响基体裂纹的起始载荷、扩展速率、断裂韧性，也将对基体裂纹的饱和裂纹密度产生极大的影响。
- The research results show that micro cracks act as an important role in the wear process of PCD tools. 同时,研究表明微观裂纹特征对聚晶金刚石刀具的磨损起着重要的作用。
- The micro cracks of concrete that formed during the injury evolution have obvious self-similarity features, which are known as fractal features. 摘要混凝土在损伤演化期间所形成的微裂纹具有明显的自相似特征，即分形特征。
- Beneath the corrosion products,inner surface of the elbows existed micro cracks from inside to outside inter-granularly,which displayed the characteristic of hydrogen corrosion. 三相微粒流造成已形成的腐蚀膜剥离,并使因氢蚀后形成晶界裂纹失去联系的晶粒与金属分离;
- The research shows that the fractal theory can be used to describe quantificationally differentiate and anomalistic micro cracks of concrete that formed in injury evolution. 研究表明，用分形理论方法可以定量描述和区分混凝土在损伤演化期间形成的极其不规则的微裂纹。
- Beneath the corrosion products, inner surface of the elbows existed micro cracks from inside to outside inter-granularly, which displayed the characteristic of hydrogen corrosion. 腐蚀产物覆盖下的内壁表面管材基体形成由内向外的微裂纹，沿晶开裂，呈现氢腐蚀特征；
- By means of experiment, the development of Fuxin fine sandstone minerals formation, micro configuration and the inner micro cracks were observed on a scale. 本实验在细观尺度下观测了不同温度条件下，阜新细砂岩的矿物组分和微结构及其发展变化，以及内部微裂纹的发生和发展。
- Inner Variable of Micro Crack Healing in Metal and Its Evolvement 金属内部微裂纹愈合内变量及其演化分析
- A little crack detracts from the value of the vase. 小小的裂痕减损那个花瓶的价值。
- The marchers jumped off at the crack of dawn. 行军队伍在破晓时出发了。
- The riot police started to crack down on them. 防暴警察开始对他们采取镇压行动。
- You'll crack up if you go on working so hard. 你继续这样拚命干下去，身体会吃不消的。
- Have another crack at solving this puzzle. 再试一试把这个难题解决了吧。
- She made a crack about his fatness. 她取笑他肥胖。
- There is a crack in this window. 这扇窗户上有个裂纹。
- She got up at the crack of dawn. 天刚亮她便起床了。
- Mary found knitting a hard nut to crack. 玛丽发现编织并非易事。
- He was the tough guy, the big shot, who gave orders with the crack of a whip. 他是个威风凛凛发号施令的强悍的家伙，是个大人物。
- How fast does the new micro process the data? 这新微型计算机处理数据有多快?
