Sometimes, it is a hard nut to crack without an expert's help.
有时候，如果没有专家的帮助，这是一件很难解决的事情。
Suddenly without warning the plane seemed to crack upas 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。
Suddenly without warning the plane seemed to crack upas 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。
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