It was an accident; Jimmy used the kid as a shield.
那是个意外，Jimmy用他儿子作挡箭牌。
For the safety of the shield, the accident prevention.
举安全之盾，防事故之患。
By analysing the shield support accident happened in coal face, discusses its reasons and divides the regions possible happened accident, points out the countermeasures.
通过对掩护支架采煤工作面发生事故的分析，论述了事故发生的原因，及可能发生事故区域的划分，并提出了防范措施。
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