I kept a straight face as long as I could, but I finally had to crack up.
我尽量板着面孔，但最后还是控制不住失声大笑起来。
Contact of crack face is considered.
考虑了裂纹面的接触。
她有一张丑得会吓破镜子的脸。
The door to the bedroom opened and Mum's face appeared around the crack.
卧室的房门打开了，妈妈的脸出现在门缝里。
The crack propagates along slip face.
断口中的二次裂纹是沿着滑移线的。
她有一张丑得会吓破镜子的脸。
她有一张丑得会吓破镜子的脸。
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