2.Family problems made him crack up.
3.A crack-up due to overwork
因操劳过度而招致的身体的衰退
4.Pressure of life caused him to crack up.
生活的压力使他身体垮了。
5.If the does not rest he will crack up soon .
他要是不休息，他很快会垮掉的。
6.If you go on working like this, you’ll crack up.
如果你继续这样干下去的话，你的身体会垮掉的。
7.Suddenly, without warning the plane seemed to crack up as it was about to take off
飞机将要起飞时，突然，没有得到任何警告，就好像要撞裂了。
8.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。
9.It is really breath-taking and entrancing to see the vast expanses of desert suddenly come to a pause and crack up to reveal hundreds of jagged grottoes carved out of the precipices in a honeycomb pattern with superb and invaluable age-old murals painted on the walls of each grotto!
当苍茫浩翰的沙漠突然中裂，高低错落的几百个洞窟在陡直的岩壁上蜂窝般排开，每个洞窟中都绘满了精美绝伦、价值连城的千年古画，这种奇迹确实是惊心动魄的。
