在开门前确任是谁后再开门，如有不任识或未预期的访客千万不要打开门户。
Check who is at the door before opening it, and do not open the door to an unexpected visitor.
快开端盖是压力容器中的一个常见的承压部件，快开端盖经常因带压开门或未关紧门升压导致各种事故。
Quick-opening closure is a common pressure-bearing component in pressure vessel. Quick-opening closure is often opened with pressure or boosted without closing the door resulting in kinds of accident.
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