My hard hat is so rigid that even a Nokia phone can't crack it! 我的安全帽很坚硬，即使诺基亚也砸不碎！
The crack in the coal seam is divided into two kinds:endogenic crack and exogenous crack.
煤层中的裂隙分两种，即外生裂隙和内生裂隙。
She was always up at the crack of dawn.
她总是在黎明时分就起床了。
The observational result of crack fracture form for rock samples with close crack under unloading after the peak compression shear load.
介绍了对含闭合裂缝岩石试件在达到峰值压剪荷载时卸荷的裂缝断裂形态观察结果。
He carefully cracked a nut and then gave it to me.
他仔细敲开一只坚果，然后递给了我。
※He that will eat the nut must first crack the shell. 欲所得，必先劳。 ※A cracked bell can never sound well. 破钟无好音。 ※He that would eat the kernel must crack the nut. 欲食果仁先破其壳.
