The two factors, the hot and humid environment having a negative effect on all systems and CMW leading to the brain mechanicalinjuries, work together so as to cause a more serious wound.
Mechanical problems were blamed for an August 2007 crash in which there were no injuries.
在2007年8月发生的坠毁事故同样被归咎于机械故障，但那次没有人伤亡。
3
The cause of this disease is not clear now. Generally speaking, chronic accumulated injuries, mechanical traction and stimulation are believed to be the major causes.