1. These tortuous crack paths with large crack deflection angle would promote crack closure as well as crack tip stress shielding and then resulted in higher crack growth resistance. 带有较大的裂纹偏差角的这些曲折的裂纹路径会促进裂纹的封闭，同时也会促进裂纹尖端的保护，接着会导致一个较高的裂纹增长抵抗性能。
2. Let him not quit his belief that a popgun is a popgun, though the ancient and honorable of the earth affirm it to be the crack of doom. 学者应该坚持自己的信仰：气枪的一响不过是啪的一声而已，尽管那些年高者与位高者断定它是世界末日的霹雳。
3. To get a bus here you have to wait till the crack of doom, ie an extremely long time. 在这儿真要等到世界末日（很久很久以后）才能有公共汽车。
4. rocky mountain. Up, up they went, to the very top. CRACK! There was a flash of lightning , and the evil Queen fell to her doom below. 猛然间天空传来一声巨响，一道耀眼的闪电划过并击中了邪恶的皇后，把她摔到山脚下，得到了应有的报应。
5. Let him not quit his belief that a popgun is a popgun, though the ancient and honorable of the earth affirm it to be the crack of doom. 学者应该坚持自己的信仰：气枪的一响不过是啪的一声而已，尽管那些年高者与位高者断定它是世界末日的霹雳。
