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Crack nucleation and propagation in wear-resistant bainite ductile cast iron were investigated by press trace method and SEM. 采用压痕法及扫描电镜观察，研究了抗磨贝氏体球铁中裂纹的形核与扩展。
The results have shown that the incubation period of crack nucleation decreases and the propagation rate of crack increases with increasing the cyclic temperature. 试验结果表明，随着循环温度的增高，裂纹形核孕育期缩短，裂纹扩展速率增大；
It was found that the initial fatigue crack nucleated at the cross edge of the hole and surfaces of the specimen by sliding. 试验结果表明 ,疲劳裂纹以滑移方式在孔壁与试样表面相交的棱上萌生 ;
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。
SIMULATION OF INTERNAL STRESSES NEAR THE SURFACE AND FATIGUE CRACK NUCLEATION FOR A COPPER SINGLE CRYSTAL IN CYCLIC DEFORMATION SATURATION STAGE 铜单晶循环变形饱和阶段疲劳裂纹萌生及表面区域内应力分布的模拟
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。
I'd do anything to see you crack a smile. 为了博得你的一笑，我情愿做任何事。
Her foot wedged in the narrow crack. 她的脚卡在那狭缝里了。
Close examination revealed a crack in the vase. 花瓶经仔细检查发现有裂缝。
It was then a hard nut to crack. 在那时是一桩很棘手的事。
This equation covers nucleation on flat substrates. 这个方程适用于在平面基底上的成核作用。
It was then a tough nut to crack. 在那时是一桩很棘手的事。