本文第四部分探讨机械伤害事故形成的原因，从原因中分析预防措施。
The fourth part explore mechanical injury accident reasons, and prevention measures from causes analysis.
开机前必须检查各部份机械和电器是否正常，以免造成机器故障或人身伤害事故。
It is important to check that all mechanical and electric parts of the machine function normally so as to prevent machine damage and personal injury.
开机前必须检查各部份机械和电器是否正常，以免造成机器故障或人身伤害事故。
It is important to check that all mechanical and electric parts of the machine function normally so as to prevent machine damage and personal injury.
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