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intermediate event

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head event, top event

hazardous condition

We may all say accidents happen. However, their occurrence may not only take human lives, destroy millions of dollars in property and lost business, they may also cost us our jobs(职业,职位) and reputations(名誉,名声).

Accidents don’t just happen; they are a result of a long process, with many steps. Many times all of these steps have to be completed before an accident can occur. If the engineer can prevent one or more of these accident steps from occurring, then he can either prevent the mishap or at least mitigate its effects.